Toro Wheel Horse 78345 User manual

Operator’s Manual
IMPORTANT: Read this manual carefully. It contains information about your
safety and the safety of others. Also become familiar with the controls and
their proper use before you operate the product.
FORM NO. 3318–947 Rev A
Wheel Horse

42” Side Discharge
Mower
for
Classic Garden T ractor
Model No. 78345 – 7900001 & Up

The TORO Co. – 1996
Printed in USA
Introduction
We want you to be completely satisfied with your
new product, so feel free to contact your local
Authorized Service Dealer for help with service,
genuine replacement parts, or other information you
may require.
Whenever you contact your Authorized Service
Dealer or the factory, always know the model and
serial numbers of your product. These numbers will
help the Service Dealer or Service Representative
provide exact information about your specific
product. You will find the model and serial number
plate located in a unique place on the product as
shown below .
1
m–2828
1. Model and Serial Number Plate
For your convenience, write the product model and
serial numbers in the space below.
Model No:
Serial No.
The warning system in this manual identifies
potential hazards and has special safety messages that
help you and others avoid personal injury, even death.
DANGER, WARNING and CAUTION are signal
words used to identify the level of hazard. However,
regardless of the hazard, be extremely careful.
DANGER signals an extreme hazard that will cause
serious injury or death if the recommended
precautions are not followed.
WARNING signals a hazard that may cause serious
injury or death if the recommended precautions are
not followed.
CAUTION signals a hazard that may cause minor or
moderate injury if the recommended precautions are
not followed.
Two other words are also used to highlight
information. “Important” calls attention to special
mechanical information and “Note” emphasizes
general information worthy of special attention.
The left and right side of the machine is determined
by sitting on the seat in the normal operator’s
position.

1
Contents
Page
Safety and Instruction Decals 2.
. . . . . . . . . . . . .
Assembly 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loose Parts 3 . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Dischar ge Chute 4 . . . . . . . . . . . . .
Attach Adjustable Link 5 . . . . . . . . . . . . . . .
Installing the Mower 5 . . . . . . . . . . . . . . . . .
Front-to-Rear Blade Slope 8 . . . . . . . . . . . . .
Transport Height Adjustment 9 . . . . . . . . . . .
Removing the Mower 9 . . . . . . . . . . . . . . . . .
Operation 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Discharge 11 . . . . . . . . . . . . . . . . . . . . . .
Operating thePower Take Off (PTO) 11 . . . . .
Page
Attachment Lift Lever 12 . . . . . . . . . . . . . . . .
Attachment Power Lift 12 . . . . . . . . . . . . . . . .
Adjusting Height-of-Cut 13 . . . . . . . . . . . . . .
Tips for Mowing Grass 14 . . . . . . . . . . . . . . .
Maintenance 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Interval Chart 15 . . . . . . . . . . . . . . . .
Cutting Blade 16 . . . . . . . . . . . . . . . . . . . . . . .
Greasing and Lubrication 18 . . . . . . . . . . . . . .
Blade Drive Belt 18 . . . . . . . . . . . . . . . . . . . . .
Power Take Off (PTO) Belt 19 . . . . . . . . . . . .
Storage 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 21 . . . . . . . . . . . . . . . . . . . . . . . . .

Safety
2
Safety and Instruction Decals
Safety decals and instructions are easily visible to the operator and are located near
any area of potential danger. Replace any decal that is damaged or lost.
ON GRASS DEFLECT OR
(Part No. 93–1 122)
ON MOWER
LEFT AND RIGHT SIDES
(Part No. 92–7108)
NEXT T O H-O-C LEVER
(Part No. 106748)

3
Assembly
Loose Parts
Note: Use the chart below to identify parts used for assembly.
DESCRIPTION QTY. USE
Grass deflector
T orsion spring
Washer 1/2” (13 mm)
Cotter pin 3/4” (19 mm)
Plastic washer
Rubber bushing
Jam nut 3/8–16
1
1
1
1
2
1
1
Install grass deflector
V belt
Idler assembly
Belt cover
Locknut
1
1
1
1
Install mower to tractor
Operator’ s Manual 1 Read before operating

Assembly
4
POTENTIAL HAZARD
•Without the grass deflector, discharge
cover, or complete grass catcher assembly
mounted in place, you and others are
exposed to blade contact and thrown
debris.
WHAT CAN HAPPEN
•Contact with rotating mower blade(s) and
thrown debris will cause injury or death.
HOW TO AV
OID THE HAZARD
• NEVER r emove the grass deflector from
the mower because the grass deflector
routes material down toward the turf. If the
grass deflector is ever damaged, replace it
immediately.
•Never put your hands or feet under the
mower.
•Never try to clear discharge area or mower
blades unless you move the power take off
(PTO) to “OFF” and rotate the ignition key
to “OFF.” Also remove the key and pull the
wire off the spark plug(s).
Installing Discharge Chute
1. Locate items show (Fig. 1).
2. Place spring short end into small hole in the
discharge chute.
3. Position spring and discharge chute over post on
rear of deck and secure with 1/2” (13 mm)
washer and 3/4” (19 mm) cotter pin (Fig. 1).
4. Slide rubber bushing and plastic washer over
stud at front of mower.
5.
Place dischar ge chute over stud and secure with
second plastic washer and 3/8” jam nut (Fig. 1).
1
3
2
5
4
6

7
Figure 1
1. Discharge chute
2. Spring
3.
Cotter pin 3/4” (19 mm)
4. W asher 1/2” (13 mm)
5. Rubber bushing
6. Plastic washer
7. Jam nut 3/8”
IMPORTANT: Discharge chute must be
spring loaded in the down position. Lift chute
up to test that it snaps to the full down
position.

Assembly
5
Attach Adjustable Link
1. Place adjustable link trunnion into rear wheel
shaft bracket and secure with hairpin cotter
(Fig. 2).
m–3467
1
2
Figure 2
1. Adjustable link trunnion 2. Hairpin cotter
Installing the Mower
1. Park the machine on a level surface, disengage
the power take off (PTO), set the parking brake,
and turn the ignition key to “OFF” to stop the
engine. Remove the key.
2. Turn the front wheels fully to the left and raise
attachment lift lever all the way to the latched
position; refer to tractor Operator’
s Manual.
3. Open front and mid-mount hitches by pushing
release button and moving lock handles forward
(Fig. 3).
1
4
2
3
m–2312
3
4
Figure 3
1. Front hitch
2. Mid-mount hitch
3. Release button
4. Lock handle

Assembly
6
4. Slide the mower under the chassis from the right
side and align attachment lift with slot in center
lever bar (Fig. 4).
5. Straighten the front wheels, turn Dial-A-Height
knob counterclockwise, all the way, and lower
the attachment lift lever to the mounting
position; refer to tractor Operator’
s Manual.
6. Place attachment lift pin into slot in center lever
bar and secure with 3/4” (19 mm) washer and
hairpin cotter (Fig. 4).
1
4
2
3
m–2824
Figure 4
1. Attachment lift
2. Slot-center level bar
3. Washer
4.
Hair pin cotter
7. Rotate front mounting shaft so fork faces up and
align so spacers are between mid-mount hitch
plates (Fig. 5).
8. Lift mower with attachment lift and guide fork
to capture hitch rod (Fig. 5). Close mid-mount
hitch lock handle.
1
4
2
3m–2825
3
5
Figure 5
1. Front mounting shaft
2. Fork
3. Spacer
4.
Mid-mount hitch plate
5. Hitch rod
9. Remove the two wing nuts and belt cover from
the tractor (Fig. 6).
m–25341
2
2
Figure 6
6. Belt cover 7. Wing nut

Assembly
7
10. Remove hairpin cotters from trunnion and
bottom of yoke (Fig. 7).
11. Unlatch and remove locking clevis pin that
secures yoke assembly to clutch shaft. Pivot
yoke out and forward to remove from clutch
shaft and engagement plate (Fig. 7).
12. Place belt in inside pulley groove (Fig. 7).
13. Assemble yoke and engagement plate and attach
locking clevis pin, trunnion and hairpin cotters
to secure (Fig. 7).
m–3443
1
23
4
1
7
6
5
Figure 7
1. Hairpin cotter
2. Trunnion
3.
Engagement plate
4. Locking clevis pin
5. Yoke
6.
Clutch shaft
7. Inside groove
14. Place pulley assembly into front hitch and lock
by moving latch rearward (Fig. 8).
2
1
m–2810
3
Figure 8
1. Pulley assembly
2. Front hitch
3. Latch
15. Route belt around V and flat pulleys and loop
over center mower spindle, top pulley.(Fig. 9).
16. Check that spacer is on shaft and install belt
cover with rod in hole. Secure with locknut
(Fig. 9).
17. Turn knob counterclockwise to tighten belt
(Fig. 9). Tighten until there is 1” (26 mm) belt
movement between engine clutch and idler
pulley when slight pressure is applied to the belt.
21
m–2823
3
7
4
5
6
Figure 9
1. V pulley
2. Flat pulley
3. Upper mower pulley
4. Spacer
5.
Belt cover
6. Locknut
7. Knob
18. Install belt cover (Fig. 6).

Assembly
8
Front-to-Rear Blade Slope
Check the front-to-rear blade slope any time you
install the mower. Before checking the slope, set air
pressure in the front and rear tires to 12 psi (.85 kPa).
If the front blade tip is not 1/8–1/4” (4–7 mm) lower
than the rear blade tip, adjust the blade slope using
the following instructions:
1. Park the machine on a level surface, disengage
the power take off (PTO), set the parking brake,
and turn the ignition key to “OFF” to stop the
engine. Remove the key.
2. Adjust height-of-cut lever on mower to the
middle of the range and lower attachment lift.
3. Carefully rotate blades so they are facing front
and rear (Fig. 10).
4. Measure between the tip of the front blade
(Fig. 10) and the tip of the rear blade to the flat
surface. If the front blade tip is not 1/8–1/4”
(4–7 mm) lower than the rear blade tip adjust
rear adjustment link.
Front 1078
1
2
3
4
4
Figure 10
1. Blade front to rear
2. Measure front blade tip
3. Measure rear blade tip
4. Measure here
5. To adjust front-to rear blade slope turn locknut
on rear adjustable link (Fig. 11).
Note: To raise the front of the mower, turn
locknut clockwise, to lower front turn
counterclockwise.
m–3498
1
2
Figure 1 1
1. Adjustable link 2. Locknut

Assembly
9
Transport Height Adjustment
Transport height is adjusted to stabilize the mower in
the up, locked position.
1. Raise attachment lift lever all the way to the
latched position. Check if bumpers, on rear of
mower draft bars contact under footrests.
2. Adjust lift chain by turning trunnion on eyebolt
in rear hole of tractor lift (Fig. 12). Turn
trunnion clockwise to raise or counterclockwise
to lower mower.
3. Transport level stops are normally in the bottom
of the slot, however they can be adjusted up for
side-to-side level when extra weight from a grass
catcher is on one side (Fig. 12).
m–2813
1
3
2
Figure 12
1. Bumper
2. Trunnion 3. Leveling
bolts
Removing the Mower
1. Park the machine on a level surface, disengage
the power take off (PTO), set the parking brake,
and turn the ignition key to “OFF” to stop the
engine. Remove the key.
2. Remove the two wing nuts and belt cover from
the tractor (Fig. 13).
m–25341
2
2
Figure 13
4. Belt cover 5. Wing nut
3. Turn knob on idler assembly clockwise to loosen
belt. Remove belt from upper mower pulley
(Fig. 14).
m–2823
2
1
Figure 14
1. Knob 2. Upper mower pulley

Assembly
10
4. Remove hairpin cotters from trunnion and
bottom of yoke (Fig. 15).
5. Unlatch and remove locking clevis pin that
secures yoke assembly to clutch shaft. Pivot
yoke out and forward to remove from clutch
shaft and engagement plate (Fig. 15).
6. Remove belt from pulley (Fig. 15).
7. Assemble yoke and engagement plate and attach
locking clevis pin, trunnion and hairpin cotters
to secure (Fig. 15).
m–3443
1
23
4
1
7
6
5
Figure 15
1. Hairpin cotter
2. Trunnion
3.
Engagement plate
4. Locking clevis pin
5. Yoke
6.
Clutch shaft
7. Inside groove
8. Open front hitch and remove pulley assembly
(Fig. 16).
2
1
m–2810
3
Figure 16
1. Pulley assembly
2. Front hitch
3. Latch
9. Raise attachment lift lever to the mounting
position; refer to tractor Operator’ s Manual.
10. Open mid-mount hitch lock handle. Lower
mower with attachment lift and remove front
mounting shaft (Fig. 17).
2
1
m–2825
Figure 17
1. Mid-mount hitch 2. Front mounting shaft
11. Remove hairpin cotter and washer from
attachment lift pin from slot in center lever bar
(Fig. 18).
1
4
2
3
m–2824
Figure 18
1. Attachment lift
2. Slot-center level bar
3. Washer
4.
Hair pin cotter
12. Turn the front wheels fully to the left and raise
attachment lift lever all the way to the latched
position; refer to tractor Operator’ s Manual.
Slide the mower out from under the chassis to
the the right side.
Note: Save all hardware, washers and hairpin
cotters for use when installing deck.

11
Maintenance
Service Interval Chart
Service Operation
Each
Use 5 Hours 25 Hours Storage Service Spring Service Notes
Cutter Blade—check X X X
Grease–Mower spindles, wheels X X
Belts—check for wear/cracks X
Mower Housing—clean X X X
Chipped Surfaces—paint X
POTENTIAL HAZARD
•If you leave the key in the ignition switch, someone could start the engine.
WHAT CAN HAPPEN
•Accidental starting of the engine could seriously injure you or other bystanders.
HOW TO AV
OID THE HAZARD
•Remove the key from the ignition switch and pull the wire off the spark plug before
you do any maintenance. Also push the wire aside so it does not accidentally contact
the spark plug.

Maintenance
12
Cutting Blade
To assure a superior quality of cut, keep the blade(s)
sharp. For convenient sharpening and replacement,
you may want to have an extra blade(s).
POTENTIAL HAZARD
•A blade that is worn or damaged could
break apart and pieces could be thrown at
bystanders or at you as you use the mower.
WHAT CAN HAPPEN
•Pieces of blade that may be thrown could
seriously injure or kill you or bystanders.
HOW TO AV
OID THE HAZARD
•Periodically inspect the blade for wear and
damage. Immediately install a new blade if
it is worn or damaged.
Inspecting the Blade(s)
1. Remove the mower; refer to Removing the
Mower, page 9.
2. Inspect the cutting edges (Fig. 19). If the edges
are not sharp or have nicks, remove the blade(s)
and sharpen them; refer to Sharpening the
Blade(s), page 13.
3. Inspect the blade(s), especially the curved area
(Fig. 19). If you notice any damage, wear, or a
slot forming in this area (Fig. 19), immediately
install a new blade.
151
1
2
3
Figure 19
1. Cutting edge
2. Curved area
3. W ear/slot forming
Removing the Blade
1. Remove the mower; refer to Removing the
Mower, page 9.
2. Carefully tip the mower over.
3. Remove the nut, flat washer, blade and washer
(Fig. 20). A block of wood may be wedged
between the blade and the mower to lock the
blade when you are removing the bolt.
4. Inspect all parts. If a defect or damage is noticed,
install new parts.
1
2
3
4
5
Figure 20
1. Nut
2. Flat washer – thick
3. Blade
4. W asher – thin
5. Spindle

Maintenance
13
Sharpening the Blade(s)
1. Use a file to sharpen the cutting edge at both
ends of the blade (Fig. 21). Maintain the original
angle. The blade retains its balance if the same
amount of material is removed from both cutting
edges.
1
Figure 21
1. Sharpen at original angle
2. Check the balance of the blade by putting it on a
blade balancer (Fig. 22). If the blade stays in a
horizontal position, the blade is balanced and can
be used. If the blade is not balanced, file some
metal off the back side of the blade. Repeat this
procedure until the blade is balanced.
12
Figure 22
1. Blade 2. Balancer
Installing the Blade(s)
1. Install the washer, blade, flat washer, and the
blade nut (Fig. 23).
IMPORTANT: The curved part of the blade
must be pointing toward the inside of the
mower to assure proper cutting.
2. Tighten the bland nut to 80-100 ft–lb
(109-136 Nm).
1
2
3
4
5
Figure 23
1. Nut
2. Flat washer – thick
3. Blade
4. W asher – thin
5. Spindle

Maintenance
14
Greasing and Lubrication
Service Interval/Specification
Grease the mower after every 25 operating hours or
once a year, whichever occurs first. Grease more
frequently when operating conditions are extremely
dusty or sandy.
Grease Type: General-purpose grease.
How to Grease
1. Disengage the power take off (PTO), set the
parking brake, and turn the ignition key to
“OFF” to stop the engine. Remove the key
2. Clean the grease fittings with a rag. Make sure to
scrape any paint off the end of the fitting(s).
3. Connect a grease gun to the fitting. Pump grease
into the fittings.
4. Wipe up any excess grease.
Where to Add Grease
1. Lubricate the blade spindle and gauge wheel
bearings (Fig. 24).
M–2829
Figure 24
Blade Drive Belt
Removing the Blade Drive Belt
1. Remove the mower; refer to Removing the
Mower, page 9.
2. Remove pulley cover mounting screws and
pulley covers from both blade pulleys.
3. Push on idler to release tension and remove the
belt from the pulleys (Fig. 25).
Installing the Blade Drive Belt
1. Install the new belt around the blade pulleys and
the idler pulley (Fig. 25).
m–2830
1
2
Figure 25
1. Idler 2. Belt
2. Install left and right pulley covers with
previously removed mounting screws.
3. Install the mower; refer to Installing the Mower,
page 5.

Maintenance
15
Power T ake Off (PT O) Belt
1. Remove the two wing nuts and belt cover from
the tractor (Fig. 26).
m–25341
2
2
Figure 26
3. Belt cover 4. Wing nut
2. Turn knob on idler assembly clockwise to loosen
belt (Fig. 27).
3. Remove locknut and belt cover from idler
assembly. Remove belt from upper mower
pulley (Fig. 27).
21
m–2823
3
7
4
5
6
Figure 27
1. V pulley
2. Flat pulley
3. Upper mower pulley
4. Spacer
5. Belt cover
6. Locknut
7. Knob
4. Unlatch and remove locking clevis pin that
secures yoke assembly to clutch shaft. Pivot
yoke out and forward to remove from clutch
shaft and engagement plate (Fig. 28).
5. Replace belt in inside pulley groove (Fig. 28).
6. Assemble yoke and engagement plate and attach
locking clevis pin, trunnion and hairpin cotters
to secure (Fig. 28).
m–3443
1
23
4
1
7
6
5
Figure 28
1. Hairpin cotter
2. Trunnion
3.
Engagement plate
4. Locking clevis pin
5. Yoke
6.
Clutch shaft
7. Inside groove

Maintenance
16
7. Route belt around V and flat pulleys and loop
over center mower spindle, top pulley.(Fig. 29).
8. Check that spacer is on shaft and install belt
cover with rod in hole. Secure with locknut
(Fig. 29).
9. Turn knob counterclockwise to tighten belt
(Fig. 29). Tighten until there is 1” (26 mm) belt
movement between engine clutch and idler
pulley when slight pressure is applied to the belt.
21
m–2823
3
7
4
5
6
Figure 29
1. V pulley
2. Flat pulley
3. Upper mower pulley
4. Spacer
5. Belt cover
6. Locknut
7. Knob
10. Install belt cover (Fig. 6).
Storage
1. Clean dirt and chaff from the outside of the
engine’s cylinder head fins and blower housing.
Also remove grass clippings, dirt, and grime
from the external parts of the entire machine,
especially the engine, shrouding, and the top of
the mower.
IMPORTANT: You can wash the machine
with mild detergent and water. Do not
pressure wash the machine. A
void excessive
use of water, especially near the control panel,
lights, engine, and the battery.
2. Scrape heavy buildup of grass and dirt from the
underside of the mower. Then wash the mower
with a garden hose.
3. Check the condition of the blade(s); refer to
Cutting Blade, page 12.
4. Check the condition of the blade drive belt.
5. Grease the mower deck; refer to Greasing and
Lubrication, page 14.
6. Check and tighten all bolts, nuts, and screws.
Repair or replace any part that is damaged or
defective.
7. Paint all scratched or bare metal surfaces. Paint
is available from your Authorized Service
Dealer.
8. Store the machine in a clean, dry garage or
storage area. Remove the key from the ignition
switch and keep it in a memorable place. Cover
the machine to protect it and keep it clean.

17
Troubleshooting
PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION
Abnormal vibration.
1. Cutting blade(s) is bent or
unbalanced. 1.
Install new cutting blade(s).
2. Blade mounting bolt is loose. 2. T ighten blade mounting bolt.
3. Engine mounting bolts are
loose. 3. T
ighten engine mounting
bolts.
4. Loose engine pulley , idler
pulley , or blade pulley .4. T
ighten the appropriate
pulley.
5. Engine pulley is damaged. 5. Contact Authorized Service
Dealer.
Blade(s) does not rotate.
1. Blade drive belt is worn, loose
or broken.
1. Install new blade drive belt.
2. Blade drive belt is off pulley . 2. Install blade drive belt and
check idler pulley and belt
guides for correct position.
3. PT O belt is worn, loose or
broken. 3.
Install new PT O belt.
Uneven cutting height.
1. T ire pressure is incorrect. 1. Set tire pressure.
gg
2. Mower is not level. 2. Level mower from
side-to-side and front-to-rear.
3. Underside of mower is dirty . 3. Clean the underside of the
mower.

18
Operation
Side Discharge
POTENTIAL HAZARD
•Without the grass deflector, discharge
cover, or complete grass catcher assembly
mounted in place, you and others are
exposed to blade contact and thrown
debris.
WHAT CAN HAPPEN
•Contact with rotating mower blade(s) and
thrown debris will cause injury or death.
HOW TO AV
OID THE HAZARD
• NEVER r emove the grass deflector from
the mower because the grass deflector
routes material down toward the turf. If the
grass deflector is ever damaged, replace it
immediately.
•Never put your hands or feet under the
mower.
•Never try to clear discharge area or mower
blades unless you move the power take off
(PTO) to “OFF” and rotate the ignition key
to “OFF.” Also remove the key and pull the
wire off the spark plug(s).
1. The mower has a hinged grass deflector that
disperses clippings to the side and down toward
the turf.
Operating the
Power T ake Off (PT O)
The power take off (PT O) engages and disengages
power to the clutch.
While the ignition key is in “RUN” position and the
power take off (PTO) is engaged, the PTO light in the
Indicator Module, will be “ON”. When this light is
“ON” it is a reminder; the starter will not crank
Engaging the Power Take Off (PTO)
1. Depress the clutch and brake pedals to stop the
machine.
2. Push the power take off (PTO) lever forward to
engage (Fig. 30).
2
m–3430
1
Figure 30
1. Engaged 2. Disengaged
Disengaging the Power Take Off (PTO)
1. Depress the clutch and brake pedals to stop the
machine.
2. Pull the power take off (PTO) lever back to
disengage (Fig. 30).