TM 5-3825-225-14&P
4-2. Unit Troubleshooting (Con’t)..
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CAUTION
DO NOT over fill the crankcase. The oil level must never be higher than the FULL
mark on the dipstick or damage to the engine may occur.
Step 2.
Check crankcase oil level. The oil level should be between the FULL and ADD marks on the dipstick.
Add oil to crankcase as necessary (see Chapter 3, Section I).
Step 3.
Check fan belt tension and tighten as necessary (see paragraph 4-51).
Step 4.
Ensure that the front of the radiator is not clogged with dust and debris.
Clean the front of the radiator as necessary.
Step 5.
Check oil filter element for clogging (see Malfunction 5, step 2).
Step 6.
Inspect and test the thermostat. Immerse the thermostat in a container of water and slowly heat the
water. Use a calibrated thermometer and observe the temperature where the thermostat begins to open.
It should begin to open at 175-182°F (79.5-83.5°C). It should be fully open at 220°F (140°C). The
opening should not be less than 0.31 in. (7.87 mm).
Replace the thermostat if it does not function properly.
7.
WATER DISTRIBUTOR PUMP WILL NOT PRIME.
Step 1.
Check for air leaks in the plumbing or suction hose on the suction side of the pump.
Tighten loose fittings and pipe joints.
Repair or replace suction hose as necessary (see paragraph 4-33).
Replace hose coupling gaskets as necessary.
Step 2.
Check the foot valve and strainer for clogging.
Clean the foot valve and strainer as necessary (see paragraph 4-32).
8.
PUMP STOPS PUMPING UNTIL THE ENGINE IS STOPPED AND RESTARTED.
Check suction hose for collapsed section.
Repair or replace suction hose as necessary (see paragraph 4-33).
9.
AUXILIARY THROTTLE CONTROL VALVE DOES NOT OPERATE.
Step 1.
Check all air lines, throttle control valve, air control valves, air reservoirs, sprinkler valves, and sprinkler
nozzles for air leaks (see Figure 4-4).
Step 2.
Check the pressure in the brake air reservoirs. The tractor air pressure gage should read greater than 75
psi (517 kPa).
If the tractor air pressure is less than 75 psi (517 kPa), refer to the tractor maintenance manual.
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