HYDROSTATIC POWER TRAIN
4203780 First Edition 5-53
5
4WD Valve
Removal and Installation
See Figure 5-49.
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 6-58.)
NOTE
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 5-49
4. Disconnect bracket (10).
NOTE
Label connector before disconnecting to ensure correct
installation.
5. Disconnect electrical connector (2).
NOTES
• Label all hydraulic hoses and tubes before
disconnecting to aid in installation.
• Close all openings with caps or plugs to prevent
contamination.
6. Disconnect hydraulic hoses (1, 3, 4, 5, 11, 12, and
14).
7. Support the 4WD valve (13).
8. Remove mounting screws (6), washers (7), lock
washers (8), and nuts (9).
9. Remove the 4WD valve (13).
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.
• Replace hydraulic oil filter and charge pressure 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 Figures 5-50 and 5-51.
NOTE
Repair of the control valve is limited to replacing valves
and cartridges or replacing O-rings.
Figure 5-50
NOTE
Record the location and orientation of the all fittings
before removing to ensure correct installation.
1. Remove straight adapter (1) from port “B.”
2. Remove 90° adapter (2) from port “R1.”
3. Remove straight adapter (3) from port “R2.”
4. Remove 90° adapter (4) from port “4WD.”
5. Remove dust cover (7), diagnostic port adapter (6),
and 90° adapter (5) from port “AD.”
TN1929
14
12
1
6 7
2
11
10
3
4
5
13
8 9
TN1974
2
3
1
4
10
5
6
7
8
9
11
To Next Page
Loading...
