Gear Pump (Vehicles With Liquid Cooled Engine) - Toro Workman 3000 Series Service Manual

Gear Pump (Vehicles with Liquid Cooled Engine)

Removal (Fig. 20)
1. Park vehicle on a level surface, raise and support bed
(if installed), shut engine off and engage parking brake.
2. Loosen pump drive belt and remove belt from pump
pulley (see Operator's Manual).
3. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
CAUTION
Before performing any service or repair on hy-
draulic system components, relieve system
pressure to avoid injury from pressurized hy-
draulic oil. Stop the engine, remove key from the
ignition switch, rotate the steering wheel in both
directions, lower or support the bed and operate
other hydraulic accessories.
4. Disconnect hydraulic hoses from gear pump (Fig.
21). Install caps or plugs in hoses and pump fittings to
prevent contamination and leakage of hydraulic oil.
5. Remove mount plate with pump from vehicle.
6. Remove gear pump from mount plate using Figure
20 as a guide.
Installation (Fig. 20)
1. Install parts as shown in Figure 20 and using the fol-
lowing instructions:
A. Apply antiseize lubricant to gear pump shaft be-
fore installing pulley.
B. After installing key and pulley on pump shaft,
tighten lock nut (Item 8) to a torque from 130 to 160
in–lb (14.7 to 18.1 N–m).
C. Apply Loctite #242 (or equivalent) to threads of
set screw and install set screw into pulley hub.
Torque set screw from 27 to 33 in–lb (3 to 3.7 N–m).
D. Install pump suction hose to bottom fitting on
pump, then fill pump through pressure port on top of
pump, with clean Dexron III ATF.
E. Install pump pressure hose to top fitting on pump.
2. After installing the pump and connecting hydraulic
hoses, install belt and adjust belt tension (see Opera-
tor's Manual).
Hydraulic System
3. Check oil level in transaxle (see Operator's Manual).
Add Dexron III ATF if necessary.
4. Start the engine and operate at idle speed until air is
out of hydraulic system.
5. Stop the engine and check oil level in transaxle (see
Operator's Manual). Add Dexron III ATF if necessary.
12
11
10
9
130 to 160 in–lb
(14.7 to 18.1 N–m)
1. Gear pump
2. Pressure hose
3. Suction hose
4. Lock nut (4 used)
5. Cap screw (4 used)
6. Pump pulley
7. Flat washer
1. Gear pump
2. Pressure hose
Page 9 – 26
ANTISIEZE
LUBRICANT
27 to 33 in–lb
(3 to 3.7 N–m)
13
6
5
7
8
LOCTITE #242
Figure 20
8. Lock nut
9. Cap screw (4 used)
10. Lock washer (4 used)
11. Fan
12. Mount plate
13. Set screw
1
3
Figure 21
3. Suction hose
Workman 3000/4000 Series
2
1
3
4
2