Manitowoc Grove TMS700E Service And Maintenance Manual page 291

TMS700E SERVICE MANUAL
Symptom
5. Brake is dragging.
Spring Brake Actuator
The upper part of the brake air chamber containing the large
spring is not serviceable; however, the lower part of the
assembly is serviceable.
WARNING
Spring brake unit is powerful enough to cause parts to fly
apart with enough force to cause personal injury. The
spring brake must be caged before removing or servicing
brakes before returning the crane to service.
1. Remove the caging bolt and washer from its storage
hole on the outside of the brake chamber.
2. Remove the dust cap from the bolt hole in the top of the
chamber.
3. Insert the head of the caging bolt through the opening
and turn bolt 1/4 turn clockwise.
4. Thread the nut and washer on the bolt and turn the nut
clockwise about 18 to 21 turns. Air pressure can be
applied to the spring brake chamber through the parking
port to compress the spring while the nut is being
tightened.
5. Do not force the nut beyond its normal stop. A torque of
40.6 Nm (30 lb-ft) is the maximum that should be
required. Reverse the procedure to uncage the spring.
Removal
Cage the spring brake before removal of air brake
chamber.
Grove
Probable Cause
a. Low spring brake hold-off air
pressure, 70 psi (482 kPa).
b. Improper connection of the
service line at spring brake.
c. Leaking lines or spring brake
seals.
DANGER
Published 01-29-2015, Control # 512-01
a.
b. Check and connect line to
c.
2
1
7
Item Description
1 Brake Air Chamber
2 Axle No. 3
3 Torque Rod
4 Drive Shaft
5 Stabilizer Beam
6 Differential
7 Mounting Bracket
1. Cage the spring brake.
2. Tag, remove, and cap the air lines to the brake air
chamber.
3. Remove the pin(s) connecting the clevis to the slack
adjuster.
4. Mark the position of the clevis on push rod so that the
clevis can be reinstalled in the same position.
UNDERCARRIAGE
Solution
Check for minimum spring
brake pressure, 4.82 bar (70
p s i ) . C h e c k f o r p r o p e r
f u n c t i o n i n g o f a i r s y s t e m
components.
proper port.
Tighten connections on air
lines or replace spring brake
unit seals.
3
4
5
6
FIGURE 8-40
8-39
8