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PTO WILL NOT ENGAGE.
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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BRAKES FAIL OR BRAKE PEDAL SPONGY. cont'd -680640398
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
BRAKES AND AIR SYSTEM
CAUTION
When repairing disc brakes, make sure stretch bolts for fastening brake caliper to
wheel hub drive housing are always fitted at side where disc emerges from pads.
Failure to do so could cause damage to equipment.
NOTE
Replace disc brake pads in sets for entire axle.
83.
BRAKES FAIL OR BRAKE PEDAL SPONGY.
Step 1.
Check for low brake fluid level in brake fluid reservoir.
If brake fluid level is low, add silicone brake fluid
(TM 5-2420-224-10).
If brake fluid level is not low, go to step 2.
Step 2.
Check for leaking and damaged hydraulic brake lines and fittings.
If hydraulic brake lines and fittings are leaking or damaged,
tighten or replace brake lines and fittings (pages 4-278, 4-280,
4-282, 4-284).
If hydraulic brake lines and fittings are not leaking or damaged,
go to step 3.
Step 3.
Check for air in hydraulic brake system.
If there is air in hydraulic brake system, bleed brake system
(page 4-262).
If there is no air in hydraulic brake system, replace brake
master cylinder (page 4-276).
84.
BRAKING UNEVEN.
Step 1.
Check hydraulic brake lines for kinks and restrictions.
If there are kinks or restrictions in hydraulic brake lines,
replace brake lines (pages 4-278, 4-280, 4-282, 4-284).
If there are no kinks or restrictions in hydraulic brake lines, go
to step 2.
Change 2

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