Manitowoc Grove TMS700E Service And Maintenance Manual page 98

HYDRAULIC SYSTEM
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.
Assembly
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.
NOTE: Lubricate head and all seals and rings with clean
hydraulic oil.
1. Install head seals 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 (Figure 2-50).
2-66
Item
1
2
3
4
5
2. Install piston seals (Figure 2-51) as follows:
a.
b. For easiest installation, warm the Teflon outer ring in
c.
d. Stretch the inner rubber expander into the seal
e.
f.
g. Install the wear ring in the wear ring groove.
Published 01-29-2015, Control # 512-01
TMS700E SERVICE MANUAL
1
3
2
Description
Static O-ring
Static Backup Ring
Head
Rod Seal
Rod Wiper
Separate the two components of the piston seal
assembly (Teflon outer ring and expander).
49° to 66°C (120° to 150°F) hydraulic fluid or water.
Lubricate the piston and all components with
hydraulic fluid.
groove. Do not use sharp edged tools and verify that
it has not twisted.
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.
The Teflon ring will have a memory and may take as
long as 24 hours to return to the correct size. This
can be accelerated by pushing the piston/seal
assembly through a honed or polished tube with an
ID equal to the nominal cylinder bore to plus 0.254
mm (0.010 in).
5
4
6433-1
FIGURE 2-50