Toro 78370 Manuale utente

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. 3319–811

Wheel Horse

52” Mower

for 5xi Tractors

Model No. 78375 – 8900001 & Up

Model No. 78370 – 8900001 & Up

The TORO Co. – 1997

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.

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.

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. . . . . . . . . . . . . . . . .

Removing the RecyclerBaffle 13. . . . . . . . .

Installing the RecyclerBaffle 13. . . . . . . . .

Operation 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Side Discharge or Mulch Grass 14. . . . . . . . .

Page

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 17. . . . . . . . . . . . . . .

Maintenance 18. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Interval Chart 18. . . . . . . . . . . . . . . .

Cutting Blade 19. . . . . . . . . . . . . . . . . . . . . . .

Greasing and Lubrication 20. . . . . . . . . . . . . .

Blade Drive Belt 21. . . . . . . . . . . . . . . . . . . . .

Storage 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 22. . . . . . . . . . . . . . . . . . . . . . . . .

Safety

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 GRASS DEFLECTOR

(Part No. 93–1122)

(2) ON LEVELER BAR

(Part No. 98–3478)

NEXT TO FRONT WHEELS

(Part No. 93–7282)

UNDER GRASS DEFLECTOR

(Part No. 92–7109)

ON MOWER REAR TOP

(Part No. 98–3480)

ON HEIGHT–OF–CUT

BRACKET

(Part No. 111655)

(1) ON GRASS DEFLECTOR

(1) ON DECK LEFT SIDE

(Part No. 92–7108)

Installation

Loose Parts

Note: Use the chart below to identify parts used for assembly.

DESCRIPTION QTY. USE

Grass deflector

Spring

Bolt 3/8–24 x 3–1/2”

Lock nut 3/8”

Install grass deflector

PTO drive belt 1 Install PTO 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 grass deflector with the holes in the

brackets and the spring straight ends in the space

under the hinge and above the deflector (Fig. 1).

3. Secure the deflector to the bracket with bolts

through the grass deflector, springs and brackets.

Secure with lock nuts (Fig. 1).

4. Lift the grass deflector and check that it is spring

loaded and pivots freely to the full down

position.

IMPORTANT: Grass deflector must be

spring loaded in the down position. Lift the

deflector up to test that it snaps to the full

down position.

m–3484

Figure 1

1. Bracket

2. Spring hook end

3. Space for spring

4. Grass deflector

5. Bolt

6. Lock nut

Installation

POTENTIAL HAZARD

•Without the grass deflector, mulch baffle,

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 AVOID THE HAZARD

•NEVER remove 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 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

key and pull the wire 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.

m–3472

Figure 2

Top View

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 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).

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

m–3463

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

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, then turn the ignition key to “STOP” to

stop the engine, set the parking brake, and

remove the ignition key.

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

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.

m–3456

Figure 6

Left Side of Tractor Shown

1. J–pin 2. Mower slot in side

mounting bracket.

Installation

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 AVOID 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

Figure 7

9. Turn the lever of the Attach–A–Matic

clockwise 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 key.

m–3457

Figure 8

1. Attach–A–Maticbutton 2. Attach–A–Maticlever

Attach the PTO Drive Belt

1. Hang the belt over the mower, then thread it

forward through the belt guide (Fig. 9) on the

mower.

m–3457

Figure 9

1. Belt 2. Belt guide

2. Extend the belt through the center of the pulley

box, between the two pulleys.

3. Release the belt tension release arm on the

pulley box housing and swing it out toward you

(Fig. 11).

Installation

4. Remove the tractor’s grill 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 AVOID 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 grooves of

the PTO pulley (Fig. 10), making sure it is also

under the pulleys in the pulley box.

m–3470

Figure 10

1. Pulley box pulley

2. Belt tension release arm 3. PTO pulley

4. PTO 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. 11).

7. 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, release the belt tension, turn the

adjustment knob and repeat steps A and B

until the indicators move to the same

position (Fig. 11).

D. Once the indicators are in the same

position, swing the tension release arm into

the pulley box and seat it by moving it into

the position shown in Figure 11.

m–3458

Figure 11

1. Belt tension release arm

2. Belt tension indicator (2)

3. Belt tension adjustment

knob

4. Seating position for

tension arm

8. Loosen the belt guide bolt (Fig. 12).

9. 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. 12).

Installation

m–3465

Figure 12

1. Belt guide

2. Belt 3. Belt touches here

4. Belt guide bolt

10. Tighten the belt guide bolt.

11. Replace the front grill 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. 13).

m–3474

Figure 13

1. Height-of-cut lever

2. Quadrant 3. High

4. Low

Checking Mower Level

For optimum efficiency, the level of the mower

should be checked at the time of initial installation

and periodically as a check, to ensure that the blades

are 1/8” (3 mm) lower in the front than in the rear.

The mower must be checked and adjusted on a flat

level surface, preferably concrete. Before checking

the mower level, set the air pressure in the front and

rear tires to 12 psi (.85 kPa). Place the mower

height–of–cut lever to the middle cut position. Make

sure the two adjustable front wheels are off the

ground.

1. Disengage the power take off (PTO), set the

parking brake, lower the attachment lift, and turn

the ignition key to “STOP” to stop the engine.

Remove the key.

2. Carefully rotate one of the blades so it is facing

front and rear (Fig. 14).

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