Remove service brake chamber clamp band
assembly (clamp closest to mounting bolts).
New spring brake unit should have release bolt
fully extended outward, like a manual released
Inspect diaphragm, return spring and inside of
Replace any worn or damaged parts.
If service brake diaphragm is being replaced,
position diaphragm on brake chamber.
Position spring brake unit (new if replaced or old
if only service brake chamber diaphragm being
replaced) on service brake chamber half. Align
air hose ports.
Install clamp band. Tap the clamp band all the
way around while tightening the clamp band nuts
to insure proper seating. Tighten nuts to 27-34
N.m (20-25 ft lbs).
Apply sealing compound to hose fittings and
install fittings and air hoses. Torque fittings to
34 N.m (25 ft lbs). Do not use impact wrench on
Apply air to service brakes. Remove locking
pliers and check for air leaks.
Adjust service brakes as outlined in the Service
Manual Section which applies.
Apply air to spring brake by pushing control at
instrument panel to release mode. Turn
release bolt clockwise to manually set spring
brake. Turn bolt until it is fully engaged into the
unit and the slotted nut bottoms on the unit.
Tighten nut to 61-68 N.m (45-50 ft lbs). Do not
use an impact wrench.
Snap breather cap in place over seal, with arrow
on breather cap pointing to the ground.
REPLACE SPRING BRAKE SUSPECTED DEFECTIVE
PUSH ROD SEAL
Do not attempt to disassemble the rower
spring section while unit is on vehicle since
it is spring loaded. Sudden accidental
release of the power spring will cause
spring brake components to be . hurled
with dangerous force which could strike
persons In the area causing serious
personal injury or death.
DIAPHRAGM. Give special attention to the
WARNING references. Perform steps 1 thru
and including 7 to remove the spring brake
chamber. Then perform steps 3, 4 and 5 in the
instructions for REPLACE SPRING BRAKE
UNIT OR SERVICE BRAKE DIAPHRAGM.
Remove the pushrod screw, plate and rod. The
screws are secured with Loctite material. To
remove the screws and pushrod assembly:
Position a phillips screwdriver handle in a
vise so that the blade extends outward.
b. Heat one of the screws to ease their removal.
Position the case assembly over the phillips
screwdriver in the vise; with a second
phillips screwdriver loosen and remove the
opposite screw (Fig. 11).
It is important to hold the case tight against the
screwdriver in the vise and slowly remove
pressure to prevent the return spring from
releasing suddenly. Remove all parts from the
case (Fig. 12).
Wash all parts in cleaning solvent.
Remove guide rings and pushrod seal (Fig. 13).
The seal can be removed by inserting a small
screwdriver behind the seal and carefully pry the
seal out of the groove as shown in Fig. 14
CTS-4101W - Page 8