Bunton BZT 3310 User manual

3DUWV )0DLQWHQDQFH
0DQXDO
Part No. 2258005 REV01
WARNING:If incorrectly used, this machine can cause severe injury. Those who
use and maintain this machine should be trained in its proper use, warned of its
dangers and should read the entire manual before attempting to set up, operate,
adjust or service the machine.
BZT 3310 Zero Turn Riding Mower
Model No. 642300

TABLE OF CONTENTS
1
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
1 TABLE OF CONTENTS
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pre-Delivery Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Preparation
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Initial Battery Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General Specifications
Power Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Engine Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Deck Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maintenance
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hydraulic Oil and Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hydraulic oil filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hydraulic Motors and Pumps . . . . . . . . . . . . . . . . . . . . . . 8
Leveling the Mower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Blade Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Blade Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Replacing Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Blade Sharpening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Safety Interlock System . . . . . . . . . . . . . . . . . . . . . . . . . 10
Battery Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Battery – Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Battery - Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance Schedule
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . 13
Daily Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Troubleshooting
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Adjustments
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Engine to Blade Belt Replace and Adjustment . . . . . . . 17
Blade to Blade Belt Adjustment . . . . . . . . . . . . . . . . . . . 18
Steering Control Adjustment . . . . . . . . . . . . . . . . . . . . . 18
Neutral and Speed Adjustment . . . . . . . . . . . . . . . . . . . 18
Drive Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Freewheel Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Park Brake Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 21
Deck Anti-Scalp Rollers . . . . . . . . . . . . . . . . . . . . . . . . . 21
Deck Installation and Adjustment . . . . . . . . . . . . . . . . . 22
Torque Specification
Important Information . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Torque Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Specific Torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Parts Listing
To Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
How To Use The Part Listing . . . . . . . . . . . . . . . . . . . . 25
Main Frame Assembly . . . . . . . . . . . Figure-1 . . . . . . . . 26
Parking Brake System . . . . . . . . . . . Figure-2 . . . . . . . . 28
Pump Drive System . . . . . . . . . . . . . Figure-3 . . . . . . . . 30
Hydraulic Drive System . . . . . . . . . . . Figure-4 . . . . . . . . 32
IMPORTANT MESSAGE
Thank you for purchasing this Bunton product. You have purchased a world class mowing product, one of the best
designed and built anywhere.
This machine comes with an Operation and Safety Manual and a separate Setup, Parts and Maintenance Manual.
The useful life and good service you receive from this machine depends to a large extent on how well you read and
understand these manuals. Treat your machine properly, lubricate and adjust it as instructed, and it will give you
many years of reliable service.
Your safe use of this Bunton product is one of our prime design objectives. Many safety features are built in, but we
also rely on your good sense and care to achieve accident-free operation. For best protection, study the manuals
thoroughly. Learn the proper operation of all controls. Observe all safety precautions. Follow all instructions and
warnings completely. Do not remove or defeat any safety features. Make sure those who operate this machine are as
well informed and careful in its use as you are.
See a Bunton dealer for any service or parts needed. Bunton service ensures that you continue to receive the best
results possible from Bunton's products. You can trust Bunton replacement parts because they are manufactured
with the same high precision and quality as the original parts.
Bunton designs and builds its equipment to serve many years in a safe and productive manner. For longest life, use
this machine only as directed in the manuals, keep it in good repair and follow safety warnings and instructions. You'll
always be glad you did.
Textron Turf Care And Specialty Products
One Bob Cat Lane
Johnson Creek, WI 53038-0469

TABLE OF CONTENTS
2TEXTRON TURF CARE AND SPECIALTY PRODUCTS
Engine Components . . . . . . . . . . . . .Figure-5 . . . . . . . . .34
Operator Platform . . . . . . . . . . . . . . . .Figure-6 . . . . . . . . .36
Steering Mechanism . . . . . . . . . . . . . .Figure-7 . . . . . . . . .38
Deck Drive System . . . . . . . . . . . . . . .Figure-8 . . . . . . . . .40
Body . . . . . . . . . . . . . . . . . . . . . . . . . .Figure-9 . . . . . . . . .42
Hood Hinge and Air Cleaner Ass’y . . .Figure-10 . . . . . . . .44
Cutting Deck . . . . . . . . . . . . . . . . . . . .Figure-11 . . . . . . . .46
Idler Assembly and Belt Guards . . . . .Figure-12 . . . . . . . .48
Deck Lift Mechanism . . . . . . . . . . . . .Figure-13 . . . . . . . .50
Fuel System . . . . . . . . . . . . . . . . . . . .Figure-14 . . . . . . . .52
Hydrostatic Pump . . . . . . . . . . . . . . . .Figure-15 . . . . . . . .54
Spindle . . . . . . . . . . . . . . . . . . . . . . . .Figure-16 . . . . . . . .56
Brake Assembly . . . . . . . . . . . . . . . . .Figure-17 . . . . . . . .56
Wheel Motor . . . . . . . . . . . . . . . . . . . .Figure-18 . . . . . . . .57
Electrical Wiring Harness . . . . . . . . . .Figure-19 . . . . . . . .58
Wiring Harness . . . . . . . . . . . . . . . . . .Figure-20 . . . . . . . .60
Index
1.0 PRE-DELIVERY CHECKLIST__________________________________________________
Product No.__
BZT 3310 Zero Turn Riding Mower
____
Power Unit
Check;
❑Wheel lug torque:
__ Drive Wheel Lug Bolt 100-120 ft. lb. (135-162 Nm)
__ Drive Wheel Hub Nut 40-50 ft. lb. (54-68 Nm)
❑Tire Pressure should be:
__ Front 20-25 psi (110-138 kPa)
__ Rear 9-11 psi (55-69 kPa)
❑Parking brake adjustment
❑Hydro Linkage neutral centering adjustment
(unit must not creep in neutral)
❑Reverse speed adjustment
❑Steering lever adjustments
Engine
Check;
❑Engine oil level
❑Engine coolant level
❑Air cleaner element and connections
❑Fan belt adjustments
Hydraulic System
Check;
❑Hydraulic oil level
❑Pinched or rubbing hoses
❑Twisted or crimped hoses
❑Oil Leaks
❑Hydro tow valve is in “Drive” position - Both pumps
Serial No._____________________________________
Electrical System
Check;
Interlock switch function
__ Parking brake switch
__ Implement control PTO switch
__ Control Lever neutral lock
__ Seat switch
❑Dash panel gauges and warning lights
❑Pinched or rubbing wires
Cutting Units
Check;
❑Adjust cutting height to customer’s specifications
❑Blade mounting bolt torque
__ 75-85 ft. lb. (102 Nm)
❑Front deck adjustment
Miscellaneous
Check;
❑Look for loose or missing hardware
❑All lubrication points
❑Examine paint finish; touch up where necessary
❑Check decals; In correct position and legible
❑Make sure all owner’s manuals are in document tube
❑__________________________________________
❑__________________________________________
❑__________________________________________
Should you encounter any areas that require repair during set-up, please explain below and fax a copy of the checklist
and the problem description to us.
Problem Description
___________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
Distributor____________________________________
Customer ____________________________________
Inspected by __________________________________
Date_________________________________________

SAFETY
3
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
2 SAFETY
NOTICE !!!
Unauthorized modifications may present
extreme safety hazards to operators and
bystanders and could also result in product dam-
age.
Textron Turf Care And Specialty Products
strongly warns against, rejects and disclaims
any modifications, add-on accessories or prod-
uct alterations that are not designed, developed,
tested and approved by Textron Turf Care And
Specialty Products Engineering Department.
Any Textron Turf Care And Specialty Products
product that is altered, modified or changed in
any manner not specifically authorized after orig-
inal manufacture-including the addition of “after-
market” accessories or component parts not
specifically approved by Textron Turf Care And
Specialty Products-will result in the Textron Turf
Care And Specialty Products Warranty being
voided.
Any and all liability for personal injury and/or
property damage caused by any unauthorized
modifications, add-on accessories or products
not approved by Textron Turf Care And Specialty
Products will be considered the responsibility of
the individual(s) or company designing and/or
making such changes. Textron Turf Care And
Specialty Products will vigorously pursue full
indemnification and costs from any party respon-
sible for such unauthorized post-manufacture
modifications and/or accessories should per-
sonal injury and/or property damage result.
This symbol means:
ATTENTION!
BECOME ALERT!
Your safety and the safety of others is involved.
Signal word definitions:
The signal words below are used to identify lev-
els of hazard seriousness. These words appear
in this manual and on the safety labels attached
to Bunton machines. For your safety and the
safety of others, read and follow the information
given with these signal words and/or the symbol
shown above.
DANGER indicates an imminently hazardous sit-
uation which, if not avoided, will result in death or
serious injury.
WARNING indicates a potentially hazardous sit-
uation which, if not avoided, could result in death
or serious injury.
CAUTION indicates a potentially hazardous situ-
ation which, if not avoided, may result in minor or
moderate injury. It may also be used to alert
against unsafe practices or property damage.
CAUTION used without the safety alert symbol
indicates a potentially hazardous situation
which, if not avoided, may result in property
damage.
DANGER
!
!
WARNING
!
CAUTION
!
!
CAUTION
TURF CARE AND SPECIALTY PRODUCTS
MODEL NUMBER
SERIAL NUMBER
JOHNSON CREEK, WI MADE IN U.S.A.
MODEL NUMBER: This number appears on
sales literature, technical manuals and price lists.
SERIAL NUMBER: This number appears only on
your mower. It contains the model number
followed consecutively by the serial number. Use
this number when ordering parts or seeking
warranty information.
SERIAL TAG

PREPARATION
4TEXTRON TURF CARE AND SPECIALTY PRODUCTS
PREPARATION
1.0 PREPARATION_____________________________________________________________
The set-up and initial testing of the unit should always be
performed by a qualified technician.
Do not attempt to drive the mower
unless you are familiar with this
type of equipment and know how to operate all
controls correctly.
1. Read each instruction completely and make sure you
understand it before proceeding with the assembly.
2. The “Right” and “Left”, “Front” and “Rear” of the
machine are referenced from the operator’s seat
when facing the direction of forward travel.
3. Park the machine on a flat level surface, engage the
brake, stop the engine, and remove the key from the
ignition switch.
1.1 INITIAL BATTERY SERVICE __________________________________________________
The battery installed in this equipment contains
electrolyte and has been fully charged. See Section 3.13
for any battery maintenance that may be required.
If the battery in the equipment is in the dry state;
1. Remove the battery and take to a proper service
area. Never fill a battery while in the mower. Filling
the battery could result in spilling acid on metal parts
causing corrosion and unsightly damage to the
mower.
Battery electrolyte is very
caustic and fumes are
explosive and can cause serious injury or death.
2. Fill the battery with electrolyte (refined sulfuric acid)
to the upper line.
3. Allow the battery to stand for at least one hour to
ensure the electrolyte fully soaks into the battery
plates.
4. Rock the battery several times during the hour to
remove any air bubbles.
5. If the level has fallen, add more electrolyte to the
upper line.
Note:
This is the only time electrolyte is to be added for
the entire life of the battery. Following the initial
filling, add clean distilled water only.
1.2 INITIAL INSPECTION ________________________________________________________
1. Perform a visual inspection of the entire unit, look for
signs of wear, loose hardware, and components that
may have been damaged during transport.
2. Inspect paint and decals for damage or scratches.
Decals provide important operating and safety
information. Replace all missing or hard to read
decals.
3. All engine fluids must be at the full level mark with
engine cold.
Check:
a. Radiator coolant level
b. Engine oil level
c. Hydraulic fluid level (See Section 3.4)
4. Make sure air filter connections are tight and cover
is securely in place.
5. Check tires for proper inflation. Tires have been over
inflated for transport.
Front – 20-25 psi (110-138 kPa)
Rear – 9-11 psi (55-69 kPa)
6. Check engine belt tension.
7. Inspect battery connections and electrolyte level.
Check that battery is fully charged.
8. Check for fuel or oil leaks.
9. Inspect lube points on tractor for proper lubrication.
10. Lower discharge chute and secure firmly in place.
CAUTION
!
WARNING
!

GENERAL SPECIFICATIONS
5
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
2 GENERAL SPECIFICATIONS
2.0 POWER UNIT_______________________________________________________________
2.1 ENGINE___________________________
Gasoline, 4 cycle, 3 cylinders, in line, liquid cooled, cast
iron block, aluminum head.
2.2 DRIVE SYSTEM ____________________
Full hydrostatic pump and wheel motor combination for
independently controlled drive wheels.
Pump:
Hydrogear 21cc variable displacement piston
pump, Series BDP21.
Motors:
Eaton Char-Lynn®, 30 cu. in. displacement,
2000 series. Direct drive 1-1/4” (31.8mm) diameter
output shaft.
Turn Radius:
Zero Inches (0”).
2.3 OPERATOR PRESENCE SYSTEM ____
Start:
The PTO (blades) must be OFF, Steering Control
Levers in the neutral lock position, and the Parking Brake
engaged for the engine to crank.
Run:
Operator must be in the seat to disengage the
Parking Brake; to move the Steering Control Levers out of
the neutral lock position; or to engage the PTO (blades)
or the engine will die. The alarm will sound when the
Parking Brake is engaged and the Steering Control
Levers are moved out of the neutral position.
The operator may leave the seat with the engine running
if the Parking Brake is engaged, the PTO (Blades) is OFF,
and the Steering Control Levers are in the neutral lock
position. A time delay eliminates annoying engine cutout
from operation over rough terrain.
2.4 CONTROLS _______________________
Throttle; choke; power takeoff (PTO) clutch switch;
traction levers; parking brake lever; lift switch.
2.5 FUEL SYSTEM _____________________
One tank on each side of operator, each with a selector
valve (1/4 turn). Total capacity 10-1/2 gallons (44 liters).
Fuel selector/shutoff switch on Right Hand panel (1/4
turn). Replaceable fuel filter.
2.6 MAXIMUM GROUND SPEEDS_________
Forward:
8 mph (12.9 km/h)
Reverse:
3 mph (4.8 km/h)
2.7 WHEELS AND TIRES ________________
Drive Wheels:
24x12.00-12 4-ply turf tread tires. Inflate
to 10 psi (0.7 kg/cm2).
Caster Wheels:
13x5.00-6 4-ply rib tread tires. Inflate to
17 psi (1.19 kg/cm2).
Braking:
Hayes disc type parking brakes.
2.8 SEAT _____________________________
High back, foam padded with standard armrests; fore and
aft adjusters; hinged for easy access to pumps and
battery; lanyard cable to hold in raised position; internally
mounted seat switch.
2.9 DRY WEIGHT ______________________
1620 lbs. (729 kg) with 72” cutterdeck.

GENERAL SPECIFICATIONS
6TEXTRON TURF CARE AND SPECIALTY PRODUCTS
2.10 ENGINE SPECIFICATIONS___________________________________________________
2.11 DECK SPECIFICATIONS ____________________________________________________
Construction:
Fabricated and welded 7 gauge, double
layer steel front and spindle mount. Full floating design.
Cutter Deck Drive System:
Electric clutch/brake drives
belt directly from engine to center spindle of engine.
Spindles: Top mounted and maintenance free, with 1”
shaft in precision machined, ductile iron housing.
Anti-Scalp Rollers:
Total of six - one at each corner, one
in front and one in rear center.
Cutting height & Production:
Electric lift allows easy
setting of cut heights from 1” to 5.0” infinitely adjustable.
A height of cut indicator provides quick and convenient
reference to height of cut that is selected.
ENGINE: B&S Vanguard, Daihatsu
Model Number 642300
Model 580477
Dry Weight 137 lbs (62 kg)
Cylinders 3; Firing Order 1-2-3
Cooling Liquid/Forced Circulation
Bore/Stroke 2.834/3.090
72/78mm
Displacement 58.1 cu. in. (952 cc)
Compression 8.63:1
Compression Pressure
@ 400 rpm 198.1 psi (14.0 kg/cm2)
Output Power 31 hp (23.1 kw) @ 3600 rpm
Output Torque 50 ft-lb (67.7 J) @ 3000 rpm
Lubrication Full Pressure
Cylinder Block Aluminum with Cast Iron
Air Cleaner Dual Element
Ignition System Electronic
Charging System 40 amp, Regulated
Battery BCI group U1
Fuel Tank Polyethylene
Fuel Consumption @
max Load/Speed 0.54 lb. / bh hr 1.8 gal/hr @ 27.5 hp (4.2 l/hr)
Electrical Protection
Charging Circuit;
40 amp Circuit Breaker
PTO and Lift;
15 amp Blade Fuse
Harness and Control Circuits;
30 amp Blade Fuse
FLUID CAPACITIES Quantity Type Filter
Fuel 10.5 gal (44.2 l)
Total Dual Tanks Regular, unleaded Gasoline Replaceable
Engine Oil 3.2 qts (3 l) SAE 10W30
SAE 10W40
SAE 10W50
Spin-On
Replaceable
Hydraulic Oil 10 qts SAE 15W40 Motor Oil
SAE 20W50 Motor Oil
15W50 Synthetic
25 micron Spin-on
Replaceable
CUTTERDECK
Type Side Discharge
Cutting Width 71.5” (181cm)
Width (Chute Up) 72.5” (184cm)
Width (Chute
Down) 84 (213cm)
Cutting Unit Three High Lift
Blades
Blade Length 24.5 in.
(457mm)
Blade Thickness 0.250 In.
Daily Production
(8 hr @ 6 mph) Up to 32 acres (13ha)

MAINTENANCE
7
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
MAINTENANCE
3.0 FUEL _____________________________________________________________________
Handle fuel with care - it is
highly flammable. Use an
approved container, the spout must fit inside the
fuel filler neck. Avoid using cans and funnels to
transfer fuel.
Never remove the fuel cap from the fuel tank, or
add fuel, when the engine is running or while the
engine is hot.
Do not smoke when handling fuel. Never fill or
drain the fuel tank indoors.
Never overfill or allow the tank to become empty.
Do not spill fuel and clean spilled fuel
immediately.
Never handle or store fuel containers near an
open flame or any device that may create sparks
and ignite the fuel or fuel vapors.
1. Fill the tractor’s fuel tank at the end of each operating
day to within 1” (25.4mm) below the filler neck to
allow room for the gas to expand.
a. Refer to the Engine Manual for the proper grade
and octane rating recommended for the mower’s
engine.
b. Be sure to reinstall and tighten the fuel caps
securely.
c. Wipe up any spilled gasoline
2. Replace fuel filter every 100 hours.
3. Store fuel according to local, state or federal ordi-
nances and recommendations from your fuel supplier.
3.1 TIRES _____________________________________________________________________
1. Keep tires properly inflated to prolong tire life. Check
inflation pressure while the tires are cool. Inspect
tread wear.
2. Check pressure once a month with an accurate, low
pressure tire gauge.
Front – 20-25 psi (110-138 kPa)
Rear – 9-11 psi (55-69 kPa)
Incorrect tire pressure will effect mowing
performance and the life of the tire.
3. Low pressure on one of the rear tires will make the
mower pull towards that drive tire and may cause
uneven cutting
4. When replacing front tires, the circumference varia-
tion from old tire to new tire must be within 2 in., (50
mm). The cutting height of the mower is directly
related to the radius of the front tires.
Improper mounting of a tire can
cause an explosion which can
result in serious injury.
Unless you have the proper training, tools and
experience, DO NOT attempt to mount a tire on a
rim. Improper mounting of a tire can produce an
explosion which may result in serious injury.
3.2 AIR FILTER_________________________________________________________________
Refer to the Engine Manual for recommended
procedures for servicing the engine air filter.
IMPORTANT:
If the mower is operated in dusty conditions, it will
be necessary to service the air filter more
frequently than usual.
3.3 ENGINE OIL ________________________________________________________________
Refer to the Engine Manual for recommended service
intervals, break-in period, weight and grade of oil used.
Never check or add engine oil
while the engine is running.
!
WARNING
!
CAUTION
!
!
CAUTION

MAINTENANCE
8TEXTRON TURF CARE AND SPECIALTY PRODUCTS
3.4 HYDRAULIC OIL AND FILTER_________________________________________________
To prevent serious injury from
hot, high pressure oil, never
use your hands to check for oil leaks. Use paper
or cardboard. Hydraulic fluid escaping under
pressure can have sufficient
force to penetrate the skin. If fluid in injected into
the skin, it must be surgically removed within a
few hours by a doctor familiar with this form of
injury. Gangrene may result if not treated
properly.
1. Park the mower on a flat level surface, lower the cut-
ting deck and stop the engine.
2. Oil temperature should be at 60°F to 90°F. Do not
check oil level when oil is hot.
3. The fluid level in the reservoir should always be
within 1” (25.4mm) from the top of the tank.
4. To fill the hydraulic reservoir, stop the engine and
add the recommended oil to the proper oil level.
IMPORTANT:
If water contamination is suspected (cloudy or
milky appearance of oil), or the oil has a rancid
odor, indicating a breakdown in the oil due to
excessive heat, change the hydraulic oil and filter
immediately.
Note:
The 25 micron suction filter is located under the
hydraulic oil reservoir tank.
3.5 HYDRAULIC OIL FILTER _____________________________________________________
The hydraulic drain valve is located under the hydraulic
oil reservoir next to the hydraulic oil filter.
1. Attach a plastic drain hose and drain the waste
hydraulic oil into an appropriate container.
2. Place collection pan on the ground just to the rear of
the cutter deck.
3. Use a funnel to direct the oil into the collection pan
when the cap is removed from the drain tube.
4. Place a thin film of oil on the gasket of the new filter
and install.
5. Fill the reservoir with the recommended hydraulic
oil.
6. Start engine and run at idle for 3 minutes to circu-
late the new oil.
7. Drive the machine to remove any air trapped in the
system.
8. Stop the engine.
a. Check reservoir oil level and add oil if necessary.
b. Check entire hydraulic drive system for leaks.
Note:
After return to service, if the hydrostatic drive
performance seems substandard, contact an
authorized Bunton Service Dealer.
3.6 HYDRAULIC MOTORS AND PUMPS____________________________________________
The hydraulic wheel motors and pumps are sealed at the
factory and should not require service. See an authorized Bunton Dealer if the wheel motors and/or pumps require attention.
!
WARNING
!
!
WARNING
!
HYDRAULIC OIL
Mineral Base
15W40 20W50
Synthetic Base
15W50

MAINTENANCE
9
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
3.7 LEVELING THE MOWER______________________________________________________
Leaving a mower running and
unattended can be fatal or
cause serious injury.
To prevent injury, lower the mower deck to the
ground, disengage all drives, engage parking
brake and stop engine before making any
adjustments.
1. Park the mower on a flat level surface.
2. Measure from the ground to the front of the deck.
With respect to the height at this point the rear of
the deck must be 3/16 inch (4.76mm) higher than
the front.
3. Adjust the rear lift chains to compensate for any
difference in height. See Section 6.9.
3.8 BLADE INSPECTION_________________________________________________________
1. The blades should be inspected every 8 hours or
whenever the mower has struck a hard object to
ensure they are in good operating condition. Blades
showing any bends, cracks or grooves must be
replaced.
2. Any of the above conditions can cause a piece of
the blade to break away and be hurled from the
mower; causing very serious injury to bystanders or
property damage.
3. A bent blade could have a microscopic crack (A)
that can grow and cause a piece of the blade to
break. Bent blades will also create vibration and
other stress on the machinery.
4. Dust or sand particles can wear a groove in the
blade (B) between the air vanes and the flat portion
of the blade. Continued use will rapidly develop the
groove into a crack (C), permitting a piece of the
vane to brake off.
Figure 3A
3.9 BLADE REMOVAL ______________________________________________________________________
1. Raise the cutting deck to the highest cutting height.
2. Stop the mower, set the parking brake, stop the
engine, remove the ignition key, and disconnect the
spark plug wires.
3. Chock the rear wheels and raise the front end of the
mower.
4. Support the front end on jack stands.
5. Remove the blade/bolt assembly from the bottom of
the deck. Place a wooden block between the blade
and the mower housing to prevent the blade from
turning.
Always support the deck
under all four corners (use
appropiate height blocks) prior to removing the
blade bolt to change blades.
3.10 REPLACING BLADE ___________________________________________________________________
1. Make certain the air vanes of the blade point toward
the mower housing. Assemble blade to cutter hous-
ing using the 5/8-18 x 2-3/4” blade bolt, blade
washer, and 2 spacer washers as shown.
2. Torque Blade Bolt to 75-85 ft. lb. (101.7-115.3 Nm).
Figure 3B
!
WARNING
!
ABC
HRCU-01
!
WARNING
!
Air Vane Point
Toward Mower Deck (up)
Washers
Spring
Washer
Blade
Spacer
Blade Bolt

MAINTENANCE
10 TEXTRON TURF CARE AND SPECIALTY PRODUCTS
3.11 BLADE SHARPENING__________________________________________________________________
1. When dressing or resharpening the blade DO NOT
follow the original angle of grind as shown in “AA”.
Grind new cutting edges on a diagonal as shown in
“AB”. Figure 3C
2. As a consequence of all resharpenings, a total loss
off of 1/2 in. (13 mm) of metal is allowable.
3. Make sure each cutting edge is equally sharpened
to prevent an unbalanced blade. This will cause
excessive vibration and may damage the mower.
4. Use a blade balancer to check the blade.
Beware of cutting edges.
Always wear gloves for safety
during blade maintenance activities.
3.12 SAFETY INTERLOCK SYSTEM _______________________________________________
Do not by-pass the safety
interlock system or switches.
They are included for your protection. Check the
safety system and mechanisms daily for proper
operation. If a defect is found, repair immediately.
Do not operate the equipment in a defective
condition.
The safety interlock system is designed to allow the
operator to start the mower only if the blades are
disengaged, the parking brake is set, and the steering
control levers are in the outward neutral lock position.
1. The engine will shut off if the operator is not in the
seat and;
a. the parking brake is disengaged.
b. the control lever is moved out of the neutral lock
position.
2. Check the switch activating mechanism and connec-
tions on a regular basis to ensure;
a. the electrical wiring is not cracked or broken.
b. all connections are tight.
c. engine components (fuel, Ignition system) are
functioning properly.
3. Check the Neutral Control switches to ensure the
plungers are fully depressed when the Neutral
Control Levers are in the lock position.
4. Check the Park Brake switch to ensure the plunger
is fully depressed when in the drive mode.
Figure 3D
3.13 BATTERY MAINTENANCE___________________________________________________
Battery acid is very caustic
and fumes are explosive and
can cause serious injury or death.
Always use insulated tools, wear protective
glasses or goggles and protective clothing when
working with batteries. You must read and obey
all battery manufacturer’s instructions.
Make absolutely certain the ignition switch is
“OFF” and the key has been removed before
servicing the battery.
1. Verify battery polarity before connecting or discon-
necting the battery cables.
Original Edge
Correct
Sharpening Pattern
Do Not resharpen
to this pattern
Total metal removed not
to exceed 1/2" (13mm)
from all resharpenings.
HRCU-07
AA
AB
CAUTION
!
!
CAUTION
!
!
Neutral
Control
Switch
(Each Side)
Parking
Brake
Switch
(Under Panel)
!
WARNING
!

MAINTENANCE
11
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
a. When installing the battery, always assemble the
RED, positive (+) battery cable first and the
ground, BLACK, negative (-) cable last.
b. When removing the battery, always remove the
ground, BLACK, negative (-) cable first and the
RED, positive (+) cable last.
2. Check the electrolyte level every 100 hours of oper-
ation.
a. Adjust to the correct level with distilled water only.
Do not expose the plates to air and do not over-
fill.
Never add electrolyte to a
charged battery. The chemical
reaction could cause serious injury.
Note:
The addition of tap water to a battery will reduce
its useful life due to contamination of salts and
other minerals.
b. When temperatures are below the freezing point
it is important that batteries be fully charged to
prevent the electrolyte from freezing.
3. Clean the cable ends and battery posts with steel
wool. Use a solution of baking soda and water to
clean the battery. Do not allow the solution to enter
into the battery cells.
4. Tighten cables securely to battery terminals and
apply a light coat of silicone dielectric grease to
terminals and cable ends to prevent corrosion. Keep
terminal covers in place.
5. Keep the outside of the battery clean and dry. Dirt
and moisture on the top surface can cause current
to trickle from one post to another causing a
discharge condition.
6. Do not cover holes in vent plugs. This may allow the
buildup of gases in the battery.
7. Keep the vent plugs tight to prevent spilling of elec-
trolyte on the top of the battery.
8. Keep the battery secured firmly in place to help
eliminate excessive vibration which could cause
internal damage and shorten the life of the battery.
3.14 BATTERY – CHARGING _____________________________________________________
Battery acid is very caustic
and fumes are explosive and
can cause serious injury or death.
Charge battery in a well ventilated area.
Batteries generate explosive gases. To prevent
an explosion, keep any device that may create
sparks or flames away from the battery.
To prevent injury, stand away from battery when
the charger is turned on. A damaged battery
could explode.
Always use insulated tools, wear protective
glasses or goggles and protective clothing when
working with batteries. You must read and obey
all battery manufacturer’s instructions.
Make absolutely certain the ignition switch is
“OFF” and the key has been removed before
servicing the battery.
1. Refer to the Battery and Charger’s manual for spe-
cific instructions.
2. Whenever possible, remove the battery from the
tractor before charging and make sure the electro-
lyte covers the plates in all the cells.
3. Make sure the charger is “OFF”, then connect the
charger to the battery terminals as specified in the
charger’s manual.
4. Always turn the charger “OFF” before disconnecting
the charger from the battery terminals.
3.15 BATTERY - STORAGE ______________________________________________________
1. Remove, clean and store battery in upright position in
a cool, dry place, fully charged.
Storage above 80°F (26.7°C) greatly increases self-
discharge. If wet batteries are discharged, the
electrolyte will freeze when stored below 20°F(-7°C).
A fully charged battery will have a hydrometer
reading of 1.260.
2. Check and trickle charge the battery every 60 to 90
days while in storage.
Note:
If the battery must be stored in the equipment,
disconnect the ground cable from the battery’s
negative terminal post.
!
WARNING
!
!
WARNING

MAINTENANCE
12 TEXTRON TURF CARE AND SPECIALTY PRODUCTS
3.16 COOLANT ________________________________________________________________
A hot radiator is under
pressure and can cause
serious burns to the body.
To prevent serious burns from hot coolant or
steam blow-out, never attempt to remove radiator
cap while engine is running. Stop engine and
wait until it is cool. Even then, use extreme care
when removing cap.
1. Check coolant level daily. The radiator and recovery
bottle should be between the FULL and LOW mark
when the system is cold.
2. If the reservoir is dry, both the reservoir and the
radiator must be filled. Fill the radiator to the bottom
of the fill cap and between the FULL and Low mark
in the reservoir.
3. Drain, flush and refill the cooling system annually.
a. Remove radiator cap. Remove radiator drain plug
and drain the system.
b. Empty and clean the recovery bottle.
c. Replace and tighten the drain plug.
Note:
Follow state or federal laws regarding the proper
procedure for disposing of antifreeze.
d. Mix 50% clean water with 50% ethylene glycol
based anti-freeze. Read and follow instructions
on anti-freeze container.
e. Start and run engine until thermostat opens
(when coolant level drops, thermostat is open).
f. Check coolant level in radiator and add coolant
as required.
4. If you have to add coolant more than once a month,
or add more than one quart at a time, have an
Authorized Bunton Distributor check the cooling
system.
Damage to the engine can occur
when adding cold water to a hot
engine.
Do not pour cold water into a hot engine. Do not
operate engine without proper coolant mixture.
Install cap and tighten securely.
Note:
Make sure the hood aand radiator air pasages
are clean. Check daily before mowing. Check
more frequently under severe conditions.
5. Keep the hood and radiator air passages clean.
Place a work light on the engine side of radiator to
inspect the air passage through the fins.
6. See the Engine Manual for more information.
!
WARNING
CAUTION

MAINTENANCE SCHEDULE
13
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
MAINTENANCE SCHEDULE
4.0 MAINTENANCE SCHEDULE __________________________________________________
MAINTENANCE
OPERATION
Maintenance is an ongoing job. These intervals are maximum times between main-
tenance operations. Perform more often under severe conditions.
FIRST 5
HOURS DAILY EVERY
25
HOURS
EVERY
50
HOURS
EVERY
100
HOURS
EVERY
200
HOURS
EVERY
500
HOURS
ENGINE
Consult the engine manual for additional information and instructions.
Check/Top up
Oil Level XX
Check for leaks X
Clean Air Intake
Screen X
Clean Air Cleaner
Precleaner X
Clean Air Cleaner
Element X
Cooling System, Radiator Inspect
Clean
Replace
Coolant
Yearly
Change Oil and Filter XSee engine manufacturer’s manual
Check/Replace
Spark Plugs X
MACHINE
Check Interlock
Operation X
Check Tire
Pressure X
Lubricate All Points X
Check Lift Chains X
Hydraulics
Check for Leaks X
Check/Top Up
Oil Level X
Change Oil and Filter XX

MAINTENANCE SCHEDULE
14 TEXTRON TURF CARE AND SPECIALTY PRODUCTS
4.1 DAILY CHECK ______________________________________________________________
Operator Presence Interlock System - Start
Operation
The safety interlock system prevents the engine from
starting unless the blades are disengaged, the Parking
Brake is set, and the Steering Control Levers are in the
outward neutral lock position.
The system also stops the engine if the operator leaves
the seat with the PTO (Blades) ON, the Parking Brake
disengaged and the Steering Control Levers out of the
neutral lock position.
To check:
For the engine to crank, the Parking Brake must be
engaged, the PTO (blades) OFF and the Steering
Control Levers in the neutral lock position. Sit in the seat
and check if the engine will crank with;
1. The Parking Brake is disengaged
2. The blades ON
3. One or both Steering Control Levers moved out of
the neutral lock position.
If the machine fails this tests find the problem and correct
before using the machine.
Operator Presence Interlock System - Run Operation
The operator must be in the seat for the engine to RUN
with the Parking Brake disengaged, the Steering Control
Levers moved out of the neutral lock position, or the PTO
(blades) ON.
To check:
Start the engine and run at 1/2 throttle with the operator
on the machine but raised off the seat.
1. Move the Parking Brake to the OFF position
2. Steering Control Levers out of the neutral lock posi-
tion (check each independently)
3. Turn the blades ON
Each test should kill the engine after 1/2 second. (A 1/2
second delay is built into the system to prevent engine
cutout when traversing rough terrain.)
If the machine fails any of these tests find the problem
and correct before using the machine.
If the problem still exists contact your authorized Bunton
Dealer.
Hardware
Tighten any nuts and bolts found loose. Replace any
broken or missing cotter pins. Repair any other problems
before operating.
Tire Pressure
Tires should be kept inflated at 20-25 psi (110-138 kPa)
front and 9-11 psi (55-69 kPa) rear. Improper tire inflation
can cause rapid tire wear and poor traction. Uneven
inflation can cause uneven cutting.
Battery
Check the electrolyte level at each oil change as follows.
1. Stop the engine and remove the key
2. Remove the battery vent caps. The electrolyte level
should reach the bottom of the vents.
3. Top up, if necessary, with distilled water.
4. Replace vent caps.

MAINTENANCE SCHEDULE
15
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
4.2 LUBRICATION ______________________________________________________________
LEGEND:
Grease - NLGI #2 Lithium Base E.P. Grease, Engine OIL - Consult the Engine Manual, Hydraulic Oil -
Mineral base oil - SAE 15W40 or 20W50; or Synthetic base oil - 15W50; Hydraulic Filter - Spin On
Automotive Type, Part No. PL8260.
IMPORTANT:
The lubrication chart indicates recommended
lubrication levels. Under severe or unusual
mowing conditions, time intervals between
lubrication may be more frequent.
IMPORTANT:
Environmental laws require used oil to be
disposed of in a specific manner. It is the
responsibility of the owner/operator/service
technician to dispose of used oil in accordance
with all applicable local, state, and federal laws.
Location Description Lube Fittings Lubrication Frequency
Engine Engine Crankcase Oil 1 See Engine Manual
Cutting Deck Belt Tension Idler Pivot Arm Grease 1 25 Hours
Cutting Deck
Lift Mechanism Chain Lift Sprockets Chain Lub — 25 Hours
Deck Drive Belt Tension Idler Pivot Oil Two
Bearings 25 Hours
Pump Drive Belt Tension Idler Pivot Grease 1 25 Hours
Hydraulic Reservoir
(Under Seat)
Hydraulic Reservoir Tank
8 Quart Capacity
25 Micron Oil Filter
Hydraulic
Oil —
Check for leaks daily. Change
oil and filter after first 5 hours
of break-in and every 500
hours thereafter.
Front Casters Caster Pivot Tube Grease 2 25 Hours
Caster Wheel Bearings Grease 2 25 Hours
Engine Crankcase
Belt Tension
Idler Pivot Arm
Chain Lift
Sprockets
Belt Tension
Idler Pivot
Hydraulic
Reservoir Tank
Caster
Pivot Tube
Caster
Wheel Bearings
(Under Seat)
(Under Floor Pan)

TROUBLESHOOTING
16 TEXTRON TURF CARE AND SPECIALTY PRODUCTS
5 TROUBLESHOOTING
5.0 TROUBLESHOOTING________________________________________________________
Before making any adjustments or performing maintenance, read the entire adjustment or maintenance section for
proper procedures and warnings.
Symptoms Probable Cause Solution
Engine does not start. Empty fuel tank or dirty fuel. Add or drain and refill with fresh fuel.
See Section 3.0.
Battery, Circuit Breakers. See Section 3.13 and Section 3.14.
Operator Back-Up System. Controls not set properly.
See Operator’s Manual (2258004).
Electrical System. See Figure-19.
Engine - Spark Plugs. See Engine Manual.
Engine hard to start or runs erratically,
stalls, looses power or stops. Fuel leaks, dirty fuel, incorrect fuel. Refill with proper grade, clean fuel. See Section 3.0.
Fuel Filter. Replace filter. See Engine Manual.
Loose Wiring. See Figure-19.
Air intake, air cleaner plugged. Clean air-intake, air filter.
See Section 3.2.
Loose water pump belt. See Section 3.16.
Engine Overloaded. Reduce forward speed.
Engine Overheating. Air intake plugged. Clean air-intake, air filter.
See Section 3.2.
Low coolant. Check radiator. See Section 3.16.
Loose water pump belt. See Section 3.16.
Engine overload. Reduce forward speed.
Battery does not hold charge. Loose, corroded battery terminals. See Section 3.13.
Low electrolyte. See Section 3.13.
Alternator not charging. Loose fan belt. See Engine Manual.
Gauges/Indicators not operating. Circuit breakers and bulbs. Reset circuit breakers, replace bulbs.
Loose wiring. See Figure-19.
Tractor does not react to steering con-
trol levers Parking brake. Disengage brake. See Section 6.7.
Free Wheel Valve. Check position of the valve.
See Section 6.5.
Low hydraulic oil. Check Oil Level. See Section 3.4.
Severe tracking left or right. Free Wheel Valve. Check position of the valve.
See Section 6.5.
Mowers do not cut or cut unevenly. Misadjusted. See Section 6.9.

ADJUSTMENTS
17
TEXTRON TURF CARE AND SPECIALTY PRODUCTS
ADJUSTMENTS
6.0 ADJUSTMENTS ____________________________________________________________
An improperly secured tractor
ready for adjustments can
cause serious injury or be fatal.
To prevent injury, lower implements to the
ground, disengage all drives, engage parking
brake, stop engine and remove key from ignition
switch before making any adjustments or
performing maintenance.
Make sure the tractor is parked on a solid and
level surface. Never work on a tractor that is
supported only by the jack. Always use jack
stands.
If only the front or rear of the tractor is raised,
place chocks in front of and behind the wheels
that are not raised. (Ensure caster wheels are
directed rearward.)
1. Adjustments and maintenance should always be per-
formed by a qualified technician. If proper adjustment
cannot be made, contact an Authorized Bob-Cat Dis-
tributor.
2. Replace, do not adjust, worn or damaged compo-
nents.
3. Do not wear jewelry or loose fitting clothing when
making adjustments or repairs.
Serious injury or death can
result from blade contact.
Be careful to prevent entrapment of the hands
and fingers between moving and fixed
components of the machine.
.
6.1 ENGINE TO BLADE BELT REPLACE AND ADJUSTMENT __________________________
The PTO drive belt consists of one single long belt run-
ning from the electric PTO clutch drive pulley (A) to the
top center spindle pulley of the cutting deck. Proper belt
tension is maintained by two V-idler pulleys (B) and (C).
Figure 6A
Engine to blade belt tension adjustment is correct when
the spring loaded idler pulley (B) is at its maximum height
when the cutting deck is at its lowest cutting height
position.
Replacement:
1. Unplug the clutch from the wire harness. Remove the
two bolts that secure the clutch to the clutch stop.
2. Lower the cutting deck to its lowest position.
The left hand idler is under
spring tension.
3. Loosen the 1/2-13 x 2-3/4” Idler Bolt (D) that
secures the Right Tension Idler (C).
4. Remove the old belt and check the pulley grooves
for damage or excessive wear. Replace if necessary.
5. Install the new belt, reattach the clutch stop and
connect the clutch connector to the wire harness.
Adjustment:
1.
Lower the cutting deck to its lowest position
.
2. Lower the Right Tensioner Idler (C) to align horizon-
tally with the Left Spring Loaded Idler (B).
3. With the idler pulleys in this position, adjust the Belt
Keeper (E) so each leg of the keeper is 1/16-1/8”
from the belt.
4. Secure Idler Bolt (D) holding the right tension idler.
5. Raise and lower the deck fully to ensure no interfer-
ence with the sprockets, idler arm, or any other
object.
6. Ensure the Belt Keeper (E) is still in position.
!
WARNING
!
WARNING
Left Spring
Loaded Idler
(B)
Right
Tensioner
Idler
(C)
Idler Bolt (D)
Clutch
Clutch
Drive
Pulley
(A)
Belt Keeper
(E)
Clutch Stop
Electrical
Connector
CAUTION
!
!

ADJUSTMENTS
18 TEXTRON TURF CARE AND SPECIALTY PRODUCTS
6.2 BLADE TO BLADE BELT ADJUSTMENT ________________________________________
A single belt supplies power to the three blade spindles.
Belt tension is maintained by a spring (D) loaded idler
pulley. Proper belt tension is maintained with a minimum
spring dimension of 3-7/8” (77mm).
Note:
Keep this area clean and periodically inspect the
blade belt for abnormal wear and proper tension.
IMPORTANT:
If the blade belt becomes worn, damaged, or
stretched beyond use; Replace it.
Note:
Before removing the blade to blade belt, the
engine to blade belt must be removed from the
center pulley.
1. Remove tension on the engine to blade belt at the
engine and remove the belt from the deck pulley.
2. Decrease the tension on the idler pulley (A) by loos-
ening the Nyloc nut (B) on the idler rod (C).
3. Remove the belt for replacement.
Reverse the procedure for installation of the new belt.
The stationary idler (E) is mounted to the deck. If the belt
rubs on the belt cover in the area as shown and the
tension idler is adjusted to its maximum position, move
the stationary idler to an appropriate mounting hole on
the deck
Increase belt tension:
To increase belt tension, turn nut (B) 1/4 turn until desired
belt tension is reached.
Figure 6B
6.3 STEERING CONTROL ADJUSTMENT___________________________________________
Steering Control Arms Position Adjustment Bracket:
1. Loosen bolts (A) holding the steering brackets to the
steering block arms.
2. Slide the bracket up or down and side-to-side for
operator comfort.
3. Check alignment and secure hardware.
Steering Control Arms:
1. Loosen bolts (B) at the lower end of handle.
2. Tilt handles forward or aft for operator comfort.
3. Check alignment and secure hardware.
Tighten the Control Rod nuts to increase the resistance
to move the Control Arm to the Neutral Lock position.
Figure 6C
6.4 NEUTRAL AND SPEED ADJUSTMENT__________________________________________
Unless the person adjusting the
steering control linkage is
thoroughly familiar with the system and
completely understands all components, the
mower should be returned to an authorized
Bunton Dealer for maintenance and adjustment.
To gain access to all control linkages, the seat mounting
base must be tilted completely forward.
With the Parking Brake
engaged, the Neutral Control
Levers in the neutral lock position and the PTO
OFF, the engine will start.
3-7/8" + 1/8"
(77mm +3mm)
A
B
C
D
Rub Area
E
Steering
Control Arm
Hardware
(B)
Position
Adjustment
Bracket Hardware
(A)
Control
Rod
CAUTION
CAUTION
!
!