3.2
Pressure and Speed Limits
3.2.1
Maximum applied air pressure is 150 PSIG
(10.2 bar).
3.2.2
Maximum coolant pressure allowable within
the water cavities is 40psi (2,7 bar) for size
36 and 48 WCB2 units and 45psi (3,1 bar)
for all other sizes. The use of an accumula-
tor or pressure relief valve may be desirable
to reduce the effect of pressure spikes in
the coolant system during operation.
Maximum allowable water pressure
is dependent upon tensioner size.
Water piping elevations, restric-
tions in outlet piping or pressure
surges may cause pressures that
exceed the maximum allowable,
resulting in damage to the
tensioner.
3.2.3
Maximum slip speeds and free wheeling
disc speeds are shown in Table 9.
Excessive slip speeds will result
in rapid friction material wear. For
good life of wear components, the
operating values in Table 9 should
not be exceeded.
3.3
Periodic Maintenance
3.3.1
As the friction material wears, adjustment of
the tensioner may be required to keep pistons
within the proper stroke range. See Section
4.0 for wear measurement, adjustment
procedures and component wear limits.
3.3.2
Periodically check for external air leakage in
the area of the piston seals (21) (23). For
replacement, refer to procedures in Section
4.0, Maintenance.
3.3.3
Moisture that may accumulate in the cylinder
can be purged. With air pressure exhausted
from the cylinder, remove the pipe plug (105)
at the 6 o’clock position on the cylinder, and
apply low air pressure to assist in expelling
any excess moisture. After draining the
cylinder, reinstall the pipe plug, applying a
pipe thread sealant on the threads prior
to installation.
Applied air pressure greater than
10psi should not be used when
draining the cylinder. Use adequate
shielding to avoid contact with
direct spray from moisture being
purged from the cylinder.
3.3.4
Periodically observe the rotating
discs while the tensioner is fully
released. Dragging discs may be caused by
wear or contamination of the gear or disc
splines, lack of spline lubrication, disc
imbalance, warped discs, or misalignment.
Correct as required.
3.3.5
Pneumatic and electrical control interlocks
should be periodically checked for proper
settings and operation.
3.3.6
If leakage or blockage of any watercooled
chamber is suspected, a static or dynamic
test may be performed as follows:
TABLE 8
Maximum Outlet
Coolant Temperature
Water/Ethylene
Glycol Mixture
% by Volume
Maximum Outlet
Coolant Temperature
o
F (
o
C )
100/0
150 (66)
70/30
165 (74)
60/40
165 (74)
50/50
170 (77)
TABLE 9
Maximum Disc Speeds
Size
Max. Slip
Speed RPM
Max. Free
Wheeling
Speed RPM
8WCB2
2150
3400
14WCB2
1260
2100
18WCSB
955
1600
24WCSB
715
1200
36WCSB
475
700
48WCSB
360
600
WCB 11070 VP 4.2 Format
13
© Copyright Eaton Corp., 2003. All rights reserved
April 2002 (Revised June 2003)
