HYDROSTATIC POWER TRAIN
4203781 First Edition 5-51
5
NOTICE
IMPORTANT
Do not disassemble the rotating kit (11). If parts are
worn or damaged, replace the entire rotating kit.
1. Disassemble traction pump as shown in Figure 5-46
on page 5-51.
2. Place parts in assembly order on a clean work area
as they are removed.
Inspection Notes
• Keeping parts in assembly order, clean and air dry
each item for inspection.
• Inspect for worn or defective parts.
• Look for metal chips or slivers during cleaning (an
indication of damage to pump or other hydraulic
component).
• Inspect all parts for cracks, nicks, burrs, and
excessive wear. Inspect for scoring, galling, and
scratches on surfaces. Replace parts as necessary.
Assembly Notes
• Assemble the pump by reversing the order of
disassembly.
• Lubricate all O-rings prior to assembly.
• Install new O-rings and seals. Use clean grease to
keep seals in position.
4WD Valve
Removal and Installation
See Figure 5-47.
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 5-47
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).
• It is important that pump parts are marked
and placed in assembly order to aid in
assembly.
• It is important that all pump parts are
absolutely clean, as contamination can result
in serious damage and/or improper operation.
• Never use shop towels or rags to dry parts
after cleaning, as lint may clog passages. Dry
parts using compressed air.
Required Materials
Overhaul Seal and Gasket Kit
(Jacobsen PN 4162516)
TN1929
14
12
1
6 7
2
11
10
3
4
5
13
8 9
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