5-14. Low Pressure Pump Air Piston Not
5-8. Lubricant Supply Pump Does Not Oper-
Tripping or Air Blowing Constantly
ate
From Air Piston
Possible Remedy
Probable Cause
Replace valves.
Defective control or
Possible Remedy
Probable Cause
metering valves.
Replace O-ring or valve
Defective O-rings or
(para 8-3d(3).
Defective pumps _______ Repair or replace pumps.
valve in air piston.
5-15. High Pressure Hose Reel Leaks at
5-9. High Pressure Pump Hose Pulsates
Swivel
with Absence of Grease Under Pressure
Possible Remedy
Probable Cause
Possible Remedy
Probable Cause
Defective packing _____ Replace packing (sect. V and
Primer valve or ball not Clean ball seat and primer
VI, ch 8).
seating properly ------ valve (para 8-2d).
5-16. Low Pressure Hose Reel Leaks at
5-10. Grease Leaking Where Tube Enters
Swivel
High Pressure Cylinder Support
Possible Remedy
Probable Cause
Possible Remedy
Probable Cause
Defective swivel -------- Replace swivel (para 8-11
Packings damaged ----- Replace packings (para 8-
and 3-13).
2d).
5-17. Grease Leaks from Chassis Control
5-11. High Pressure Pump Air Piston Not
Handle Chuck
Tripping or Air Blowing Constantly
Possible Remedy
Probable Cause
From Air Piston
Adjust trigger (para 3-102).
Trigger not properly
adjusted.
Possible Remedy
Probable Cause
O-ring or valve in air Replace (para 8-2d)
Defective ball seat in- Relpace insert or ball (para
sert or ball.
3-102).
piston worn or dam-
aged.
5-18. Grease Leaks from High Pressure
Chassis Control Valve Stem
5-12. Low Pressure Pump Operates with
Possible Remedy
Probable Cause
Control Handle Shut Off
Packing worn or dam-
Replace packing (para 3-
Possible Remedy
Probable Cause
aged.
102).
Foreign matter in foot Clean valve (para 8-3d(1).
valve.
Foreign matter in trans- Clean valve (para 8-3d(1).
When Valve is Off
fer valve.
Possible Remdy
Probable Cause
Defective valve ___________ Replace valve (para 3-103).
5-13. Oil Leaking Where Tube Enters Low
Trigger not adjusted_____Adjust trigger (para 3-
Pressure Pump Adapter
103d) .
Defective O-rings _______ Replace O-rings (para 3-
Possible Remedy
Probable Cause
103).
Defective seal __________ Replace seals (para 8-3d(2).
Section Ill. REMOVAL AND INSTALLATION OF MAJOR
COMPONENTS AND AUXILIARIES
(2) Refer to figure 5-1 and remove the
5-20. General
back plate.
This section contains the removal and installa-
tion instructions for the service brakes back-
b. Cleaning and Inspection.
plate, trailer frame, and the air tank receiver.
(1) Clean the backplate with an approved
cleaning solvent and dry thoroughly.
(2) Inspect for cracks, breaks, and other
damage.
Removal.
a.
(3) Replace a damaged or defective back-
(1) Remove the brake shoes and wheel
plate.
cylinders (para 3-76).
