Toro Wheel Horse 78370 User manual

Operator’s Manual
IMPORTANT: Read this manual, and your tractor manual, carefully. They
contain 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. 3322–393
Wheel Horse

52” Mower
for 5xi Tractors
Model No. 78370 – 9900001 & Up

The TORO Co. – 1999
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–3469
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.
. . . . . . . . . . . . .
Installation 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loose Parts 3 . . . . . . . . . . . . . . . . . . . . . . . . .
Mower Preparation 3 . . . . . . . . . . . . . . . . . . .
Installing the Mower 4 . . . . . . . . . . . . . . . . .
Attach the PTO Drive Belt 6 . . . . . . . . . . . . .
Adjusting the Mower 8 . . . . . . . . . . . . . . . . .
Removing the Mower 11 . . . . . . . . . . . . . . . . .
Operation 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Discharge 14 . . . . . . . . . . . . . . . . . . . . . .
Operating the Power Take Off (PTO) 14 . . . .
Attachment Lift Lever 15 . . . . . . . . . . . . . . . .
Adjusting the Two Front Wheels 16 . . . . . . . .
Check for Debris 16 . . . . . . . . . . . . . . . . . . . .
Tips for Mowing Grass 16 . . . . . . . . . . . . . . .
Page
Maintenance 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Interval Chart 18 . . . . . . . . . . . . . . . .
Cutting Blade 19 . . . . . . . . . . . . . . . . . . . . . . .
Greasing and Lubrication 20 . . . . . . . . . . . . . .
Checking PTO Drive Belt Tension 21 . . . . . .
Extending PTO Drive Belt Life 21 . . . . . . . . .
Blade Drive Belt 22 . . . . . . . . . . . . . . . . . . . . .
Storage 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Washing the Underside of the Mower 23 . . . .
Troubleshooting 24 . . . . . . . . . . . . . . . . . . . . . . . . .

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 MOWER RIGHT SIDE
(Part No. 98–3481)
ON DISCHARGE CHUTE
(Part No. 93–1 122)
(2) ON LEVELER BAR
(Part No. 98–3478)
NEXT T O FRONT WHEELS
(Part No. 93–7282)
UNDER DISCHARGE CHUTE
(Part No. 92–7109)
ON MOWER REAR T OP
(Part No. 98–3480)
ON HEIGHT–OF–CUT
BRACKET
(Part No. 1 11655)
(1) ON DISCHARGE CHUTE
(1) ON DECK LEFT SIDE
(Part No. 92–7108)

3
Installation
Loose Parts
Note: Use the chart below to identify parts used for assembly.
DESCRIPTION QTY. USE
Discharge Chute
Spring
Bolt 3/8–24 x 3–1/2”
Lock nut 3/8”
1
2
2
2
Install discharge chute
PT O drive belt 1 Install PT O drive belt
Pulley box 1 Install pulley box
Operator’ s Manual 1 Read before operating
Mower Preparation
Install the Discharge Chute
1. Place the springs into the brackets on the mower
with the hooked ends over the raised back of the
bracket (Fig. 1).
2. Align the discharge chute with the holes in the
brackets and the spring straight ends in the space
under the hinge and above the chute (Fig. 1).
3. Secure the chute to the bracket with bolts
through the discharge chute, springs and
brackets. Secure with lock nuts (Fig. 1).
4. Lift the discharge chute and check that it is
spring loaded and pivots freely to the full down
position.
IMPORTANT: Discharge chute must be
spring loaded in the down position. Lift the
chute up to test that it snaps to the full down
position.
1
5
3
6
m–3484
4
2
Figure 1
1. Bracket
2. Spring
hook end
3. Space for spring
4. Discharge chute
5. Bolt
6.
Lock nut

Installation
4
POTENTIAL HAZARD
•Without the discharge chute 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 discharge chute from
the mower because the discharge chute
routes material down toward the turf. If
the discharge chute is ever damaged,
replace it immediately. Never put your
hands or feet under the mower.
•Never try to clear the discharge area or
mower blades unless you move the power
take off (PTO) to “OFF” and turn the
ignition key to “STOP.” Also remove the
ignition key and pull the wire(s) off the
spark plug(s).
Mower Belt Routing
1. Route the mower belt as shown in Fig. 2. Be
sure to install the belt on the lower mower deck
pulley.
2
1
Figure 2
T op V iew
1. Mower belt 2. Mower deck pulley
Installing the Mower
Initial Preparation
The mower is most easily installed when done on a
level concrete surface. Rougher dirt or lawn surfaces
make installation more difficult.
1. Position the tractor and mower side by side, with
the mower on the right–hand side of the tractor.
2. Set the parking brake, raise the attachment lift,
and turn the ignition key to “STOP” to stop the
engine. Remove the ignition key.
3. If you have previously had a snowthrower, blade
or tiller attached to the attachment lift, remove
the two clevis pins on each side of the
attachment lift (Fig. 3).
2
1
m–3433
Figure 3
1. Clevis pin 2. Hairpin cotter
4. Attach the pulley box if it is not already on the
tractor. Make sure the latches on the tractor’s
front Attach–A–Maticare open (Fig. 4). Then
slide the pulley box into the Attach–A–Matic
latches and seat it. Close the latches.

Installation
5
m–3463
1
22
3
4
5
6
7
Figure 4
1. Attach–A–Matic latches
2. Pulley box
3. Idler pulley
4. Belt tension release arm
5. Belt tension adjustment
knob
6. Belt tension indicators
(one on each side)
7. Attach–A–Matic button
(one on each side)
Attach the Mower
1. Make sure the mower wheels are set for low
height of cut.
2. Make sure the attachment lift is in the full up
position.
3. From the driver’s right–hand side of the tractor,
slide the mower under the tractor.
4. After sliding the mower under the tractor,
position it so that the slots in the side of each of
the mower’s mounting brackets (Fig. 5) are
aligned directly below the tractor’
s attachment
lift arm.
m–3468
1
2
3
Figure 5
1. Slots in the side mounting
brackets (2)
2. Belt guide
3. Front–to–rear adjustment
rod
5. Start the tractor.
6. Lower the attachment lift arm fully and adjust
the deck’s position until you can pull out on the
J–pin of the lift arm and slide it into the slot in
the mounting bracket of the mower (Fig. 6).
7. On the driver’s left–hand side, pull out the
attachment lift J–pin and slide it into the slot on
the other mower mounting bracket.
1
2
Figure 6
Left Side of Tractor Shown
1. J–pin 2. Mower slot in side
mounting bracket.

Installation
6
8. After the two J–pins are seated through the
mower’s mounting brackets, using the
attachment lift and your hand on the right front
adjustable mower wheel bracket (Fig. 7),
position the mower so its attachment bar fits into
the mid Attach–A–Maticmount.
POTENTIAL HAZARD
•The “scissor” formed by the mower
mounting brackets and the attachment lift
arm is dangerous.
WHAT CAN HAPPEN
•Hands and fingers can get caught between
the mower parts and the tractor and be
injured.
HOW TO AV
OID THE HAZARD
•Keep hands away from moving parts while
operating the attachment lift.
•Always position the mower with your hand
on the right front mower wheel bracket.
•Never try to position the mower with your
hands on the mower mounting brackets or
below the mower housing.
m–3500
1
Figure 7
1. Place hand here
9. Turn the lever of the Attach–A–Matic
counterclockwise to lock the mower to the
tractor (Fig. 8).
10. Set the parking brake, lower the attachment lift,
and turn the ignition key to “STOP” to stop the
engine. Then remove the ignition key.
m–3611
12
3
Figure 8
1. Attach–A–Matic button
2. Attach–A–Matic lever
3. Lock
Attach the PT O Drive Belt
1. Hang the belt over the mower, then thread it
forward through the belt guide (Fig. 9) on the
mower.
m–3457
1
2
Figure 9
1. Belt 2. Belt guide
2. Extend the belt through the center of the pulley
box, between the two pulleys.

Installation
7
3. Release the belt tension release arm on the
pulley box housing and swing it out toward you
(Fig. 12).
4. Remove the tractor’s grille by pulling it straight
out toward you.
POTENTIAL HAZARD
•Components under the hood will be hot if
the tractor has been running.
WHAT CAN HAPPEN
•Touching hot components can cause burns.
HOW TO AV
OID THE HAZARD
•Allow the tractor to cool before performing
maintenance or touching components
under the hood.
5. Position the end of the belt into the groove of the
PTO pulley (Fig. 10), making sure it is also
under the pulleys in the pulley box.
m–4231 1
3
2
Figure 10
1. Pulley box pulley
2. PT O pulley
3. PT O drive belt
6. Loop the other end of the belt over the drive
pulley of the mower. Additional belt slack can
be obtained (if needed) by turning the belt
tension adjustment knob (Fig. 12).
7. Make certain that the wide side of the PTO drive
belt is toward the outside diameter of all (four)
pulleys (Fig. 11).
m–4230
ÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉ
2
1
Figure 1 1
1. Pulley outside diameter 2. Wide side of belt

Installation
8
8. Now adjust the belt tension.
A. Push the belt tension release arm back
toward the pulley box to tension the belt.
B. Check the tension indicators on each side of
the pulley box.
C. If the tension indicators are not in the same
position on both the left and right sides,
release the belt tension, turn the adjustment
knob and repeat steps A and B until the
indicators move to the same position (Fig.
12).
D. Once the indicators are in the same position
on both sides, swing the tension release arm
into the pulley box and seat it by moving it
into the position shown in Figure 12.
m–3458
1
3
24
5
Figure 12
1. Belt tension release arm
2. Belt tension indicator (2)
3. Belt tension adjustment
knob
4.
Seating position for
tension arm
5. Belt tension released
9. Loosen the belt guide bolt (Fig. 13).
10. Adjust the belt guide so that it just touches the
belt on the inside arm of the guide (toward the
center of the deck) (Fig. 13).
m–3465
1
2
3
4
Figure 13
1. Belt guide
2. Belt 3.
Belt touches here
4. Belt guide bolt
11. Tighten the belt guide bolt.
12. Replace the front grille of the tractor.
Adjusting the Mower
Adjusting the Height of Cut
The rear gauge wheels are adjusted in different hole
locations for 1 1/2–4 1/2” (4–11 cm) heights of cut.
1. Start the tractor, apply the parking brake, and
raise the deck. Get off the tractor. Pull the
height–of–cut lever out to disengage it from the
quadrant. Adjust the height of cut to the desired
level. Release the lever inward to lock into the
quadrant (Fig. 14).