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Page Title:
Table 12. Braking System (Unit) Troubleshooting Procedures. |
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 TM 10-3930-660-24-1
TROUBLESHOOTING PROCEDURES - CONTINUED
0006 00
Table 12. Braking System (Unit) Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Check parking brake cable
Readjust as necessary (WP 0128
1.
Parking Brake Will Not Hold Unit.
for proper adjustment.
2. Inspect parking brake drum
Replace if worn or glazed (WP
lining.
3. Check for missing or
Replace if necessary (WP 0128
damaged parking brake
linkage.
1. Check for out of adjustment
Adjust or replace parking brake
2.
Parking Brake Will Not Release.
parking brake linkage.
cable (WP 0128 00).
2. Check for binding of internal
Remove parking brake drum and
parking brake mechanism.
inspect for wear or damage (WP
1. Check for air in brake
Bleed brake system (WP 0129
3.
Poor or No Brakes.
system.
2. Check for leaking, damaged
Repair or replace brake lines as
or obstructed brake lines.
necessary (WP 0133 00).
3. Check for low accumulator
Replace tandem gear pump if
pressure caused by weak
low flow and pressure is found
tandem gear pump output.
4. Check for low accumulator
Adjust accumulator charging
charging pressure.
pressure as needed in brake
control valve (WP 0131 00).
5. Check for low nitrogen
Replace or repair accumulator if
precharge or faulty
necessary (WP 0132 00).
accumulator.
6. Check for leakage at service
Inspect service brake shoe
brake shoe calipers.
calipers for oil. Replace service
brake shoe calipers (WP 0249
00).
7. Check for worn service
Replace service brake shoes if
brake shoes.
necessary (WP 0130 00).
8. Check for low hydraulic oil.
Add hydraulic oil to proper level
1. Check that brake pedal is
Inspect brake linkage and spring.
4.
Brakes Will Not Release.
returning to full up position.
Replace linkage and spring if
necessary (WP 0131 00).
2. Inspect pistons in service
Replace service brake calipers if
brake caliper for binding.
necessary (WP 0249 00).
3. Check for restrictions and
Remove restriction in return
excessive back pressure in
line. Replace or repair lines as
return line.
necessary (WP 0133 00).
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