4.7.13
Carefully place the piston onto the cylinder
with the chamfered edge of the piston facing
downward, taking special care to avoid
damaging the seal lips.
4.7.14
Gradually apply an evenly distributed force to
press the piston into the cylinder being sure
not to cock the piston which may damage the
sealing surfaces. The use of ’C-clamps’ may
assist with the assembly process.
4.7.15
Using a lifting strap, slide the cylinder/piston
assembly onto the studs.
4.7.16
Lubricate the threads on the end of the studs
with 30 wt. oil or anti-seizing compound and
install the washers (17) and locknuts (18) .
4.7.17
While supporting the weight of the
cylinder/piston assembly, tighten the locknuts,
ONE TURN AT A TIME and in an alternating
(crosswise) pattern until the cylinder is seated
firmly against the clamp tubes. Torque the
locknuts to the appropriate value. See Table 4.
The locknuts (18) must be tightened
gradually to prevent damage to the
tensioner components.
4.7.18
Connect an air supply line to one of the ports
in the cylinder, plugging the remaining port(s).
4.7.19
Perform an air test by applying 80 PSIG (5.5
bar) to engage the tensioner. Shut off the air
supply. If the air pressure does not drop below
70 PSIG (4.8 bar) after 10 minutes, the seals
have been properly installed. If excessive leak-
ing is found, disassemble the piston / cylinder
adn inspect the seals or sealing surfaces for
damage. repair or replace components as
required.
4.8
Bushing Replacement
Note: Some pressure plate and reaction
plates have bushings installed in the
reaction holes. (Typically corrosion resistant
units, and older size 36" tensioners). See
Figure 20. If applicable, replacement of the
bushings can be performed per the following
procedures.
4.8.1
Disassemble per Section 4.3.
4.8.2
Refer to the wear limits in Table 14 to
determine if the bushings (54) require
replacement.
4.8.3
Heat up the area around each bushing to
soften the Loctite
®
and press out the old
bushings.
4.8.4
Clean the bores in the mating component,
removing any residual Loctite
®
.
4.8.5
Apply Loctite
®
#RC601, 635 or 680 to
the bushing O.D. and mating hole in the
reaction plate using a swab. Apply enough
liquid to entirely fill the space between the
parts. Install the bushings by twisting the
bushing while pushing it down, until it is
flush with the casting surface. Inspect to
see that a ring of liquid adhesive is visible
at the parting line. Reapply Loctite if
required. Allow the Loctite to cure for 15
minutes before moving the sub assembly.
4.8.6
Assemble the tensioner per section 4.9,
as required.
Figure 19
Figure 20
8 & 14
WCB2
18, 24, 36 &
48 WCB2
WCB 11070 VP 4.2 Format
24
© Copyright Eaton Corp., 2003. All rights reserved
April 2002 (Revised June 2003)
