TM 5-4320-302-14
5-2. SYMPTOM INDEX
Refer to the Symptom Index below. Locate the malfunction which is the same, or most nearly the
same, as the trouble you are having with the centrifugal pump unit. The Symptom Index lists the
first page of troubleshooting information for that malfunction. Follow the steps one by one, and per-
form the corrective actions listed.
Malfunction
Number
Description
Page
1
Engine fails to crank or cranks at low speed
5-2
2
Engine cranks but fails to start
5-2
3
Engine starts but runs unevenly, stalls, or surges
5-3
4
Engine stops running or produces black, white, or grey smoke
5-4
5
Engine consumes excessive lube oil
5-5
6
Pump does not discharge or has low discharge pressure
5-5
7
Pump makes excessive noise
5-5
Table 5-1. Direct Support Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE FAILS TO CRANK OR CRANKS AT LOW SPEED
Step 1. Check for faulty starter motor. Remove and test (para 5-18).
Repair faulty starter motor (para 5-18).
Step 2. Check for restricted impeller.
Remove volute (para 5-4) and remove foreign objects restricting impeller.
2. ENGINE CRANKS BUT FAILS TO START
Step 1. Check for loose cylinder head bolts.
If loose, tighten in a crosswise manner with socket spanner No. 120040/
120050 to 22 ft lb (30 N.m).
Using torque gage 101900,
tighten bolts three additional
45 degree increments.
5-2
