2-87
TMS800E SERVICE MANUAL HYDRAULIC SYSTEM
Published 01-29-2014, Control # 496-00
Inspection
1. Inspect the rod. There should be no scratches or pits
deep enough to catch the fingernail. Pits that go to the
base metal are unacceptable. Chrome should be
present over the entire surface of the rod. If lack of
chrome on rod, the rod should be replaced.
2. Inspect rod for straightness. Determine if it can be
straightened or must be replaced.
3. Inspect the head. Visually inspect the inside bore for
scratching or polishing. Deep scratches are
unacceptable. Polishing indicates uneven loading, and
the bore should be checked for out-of-roundness.
4. Inspect the piston. Visually inspect the outside surface
for scratches or polishing, Deep scratches are
unacceptable. Polishing indicates uneven loading, and
the diameter should be checked for out-of roundness.
5. Inspect the barrel carefully for scoring, scratches and
pits. There should be no scratches or pits deep enough
to catch the fingernail. If barrel is scored, it must be
repaired or replaced.
6. Thoroughly rinse parts, allow to drain, and wipe with a
lint-free rag. Inspect all parts for serviceability.
Assembly
NOTE: Lubricate head and all seals and rings with clean
hydraulic oil.
1. Install head seals (see Figure 2-60) as follows:
a. Using round-nose pliers or special installation tools,
twist the dual lip u-cup seal into a “C” shape and
allow it to snap into groove.
b. Using a similar method as in step no. 1, install the
wiper.
c. Install the static O-ring and backup ring into the
static seal groove verifying that the backup ring is
closest to the retaining ring groove.
d. If possible, the head/seal assembly should sit for at
least one hour to allow the seals to elastically
restore.
e. Install wiper ring and seal in the inside of the head.
2. Install piston seals (see Figure 2-61) as follows:
a. Separate the two components of the piston seal
assembly (Teflon outer ring and expander).
b. For easiest installation, warm the Teflon outer ring in
49°C to 66°C (120°F to 150°F) hydraulic fluid or
water.
c. Lubricate the piston and all components with
hydraulic fluid.
d. Stretch the inner rubber expander into the seal
groove. Do not use sharp edged tools and verify that
it has not twisted.
e. Stretch the Teflon outer ring into the groove. This
can be done without tools by using a piece of string
or a clean used O-ring to work the Teflon seal
around the piston and into the groove. Be careful
not to damage the seal grooves during installation.
Scratching the groove may cause by-pass leakage.
f. The Teflon ring will have a memory and may take as
long as 24 hours to return to the correct size. This
CAUTION
Before installing new seals and rings, clean all surfaces
and carefully remove burrs and nicks. Parts displaying
excessive wear or damage should be replaced.
CAUTION
When installing new seals and rings, avoid stretching
seals or scratching the grooved or gland surfaces. Make
sure parts are clean before and during assembly. Make
sure seals and rings are installed in the proper order.
Item Description
1 Static O-ring
2 Static Backup Ring
3 Head
4 Rod Seal
5 Rod Wiper
Reference Only
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