HYDROSTATIC POWER TRAIN
673831-Rev A 5-45
5
4WD Valve
Removal and Installation
See Figure 5-41.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Drain hydraulic oil tank. (See “Hydraulic Oil Tank—
Drain Procedure” on page 6-49.)
The 4WD valve is located on the bottom center of
machine.
3. Thoroughly clean the valve, especially the area
surrounding the hydraulic hoses, tubes, and fittings.
Figure 5-41
Label connector before disconnecting to ensure correct
installation.
4. Disconnect electrical connector (16).
• Label all hydraulic hoses and tubes before
disconnecting to aid in installation.
• Close all openings with caps or plugs to prevent
contamination.
5. Disconnect forward hydraulic hose (1) and forward
tube (2). Not orientation and remove tee fitting (3).
6. Disconnect reverse hydraulic hose (4) and reverse
tube (5). Note orientation and remove tee fitting (6).
7. Disconnect rear motor tubes (7, 8, 9 and 10).
Remove four straight fittings (11).
8. Support the 4WD valve (12).
9. Remove two mounting screws (13), lock washers
(14) and flat washers (15).
10. Remove the 4WD valve (12).
Installation Notes
• Install the 4WD valve by reversing the order of
removal.
• Lubricate all O-rings prior to assembly.
• Make sure new O-rings are in place before installing
hoses on fittings.
• Torque four straight fittings (11) to 60 lb-ft (81 N·m).
• Torque rear motor tubes (7, 8, 9 and 10) to 48 lb-ft
(65 N·m).
• Torque tee fittings (3 and 6) to 60 lb-ft (81 N·m).
• Torque traction hoses and tubes (1, 2, 4 and 5) to 65
lb-ft (88 N·m).
• Replace charge filter.
• Refill hydraulic oil tank. (Refer to “Safety, Operation,
and Maintenance Manual” for oil specifications.)
• Start engine. Check hydraulic system for leaks.
Repair as necessary.
• Check hydraulic oil level and add if necessary.
Disassembly, Inspection, and Assembly
See Figure 5-42.
Repair of the lift valve is limited to replacing valves and
cartridges or replacing O-rings.
Figure 5-42
Record the location of the all cartridges before removing
to ensure correct installation.
11. Remove nut (19) and solenoid coil (20) from 4WD
solenoid valve (18).
12. Remove 4WD solenoid valve (18) from valve block
(17).
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