HYDROSTATIC POWER TRAIN
4252490-Rev A 5-55
5
Trunnion and Shaft Seals
1. Remove retaining rings (21) and washers (20).
NOTICE
2. Carefully pry seals (19) out of housing bore.
3. Clean and inspect the shaft, remove any sharp
edges.
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).
Assembly Notes
• Install seals by reversing the order of removal.
• The outside diameter of the seals may be coated
with a sealant (such as Loctite
®
High Performance
Sealant #5923) prior to installation. This will aid in
preventing leaks caused by seal bore damage.
• Cover the end of the shaft with tape before installing
the charge pump housing to prevent damaging the
seals (19).
• Apply a thin film of clean hydraulic oil to seals (19)
before assembly.
Flushing Valve
Removal and Installation
See Figure 5-55.
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 6-42.)
3. Raise fuel/hydraulic tank. (See “Raise Hydraulic
Oil/Fuel Tank” on page 9-4.)
NOTE
The flushing valve is located at the rear of the machine,
on the left side, at the base of the left OPS strut.
4. Thoroughly clean the valve, especially the area
surrounding hydraulic hoses, tubes, and fittings.
Figure 5-55
NOTES
• Label all hydraulic hoses and tubes before
disconnecting to ensure correct installation.
• Close all openings with caps or plugs to prevent
contamination.
5. Disconnect tee fittings (1 and 2) from flushing valve
assembly (6).
When removing seals, use caution to prevent
damaging the housing bore or shaft surfaces.
TN3915
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