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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2
Check all air lines and connections for leaks. Check with bubble test
Replace/remake connections or replace hose, (see para. 4-9)
Step 3
Check quick release valve exhaust for leaks
Repair valve as required, (see para. 4-22)
Step 4
Check brake treadle valve for leaks
Repair as required, (see para. 4-22)
8g
ENGINE FOOT THROTTLE WILL NOT OPERATE
Step 1
Check all air lines from foot throttle to throttle air chamber
Repair/replace as required, (see para. 4-9)
Step 2
Check for air leaks from throttle air chamber
Replace air chamber, (see para. 4-28)
Step 3
Check air chamber rod is connected to engine governor shaft
Reconnect or replace air chamber as required
Step 4
Foot throttle valve damaged
Repair foot throttle valve, (see para. 4-22)
8h
BRAKE SHOES SMELL OF BURNING
Step 1
Check if brake shoes are dragging
a
Adjust shoes, (see para. 4-30 or 4-32)
b
If rear only, parking brake air pressure is low or parking brake diaphragm has leak
Replace air chamber or check for leaks in parking brake circuit
Step 2
Check if brake drums are full of sand/mud
Clean drums when cool to touch
Step 3
Clean brake shoe return springs
Replace if broken, (see para. 4-30 or 4-32)
4-39
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