Section IV. TROUBLESHOOTING - TM-5-4320-258-120028

Operator Maintenance Category

Daily Schedule (or weekly)

Interval and sequence No.

Before

During

After

Item to be

Procedure

Paragraph

operation operation operation

inspection

reference

Fan drive belt

Belt must deflect to 1 inch with

Paragraph 4-30a

thumb pressure at midpoint of longest

belt span. If loose, report to organiza-

tional maintenance.

Exhaust system

Check weather cap for free operation.

Paragraph 4-19

Check muffler and pipes for damage

and leaks. Free sticking weather cap.

Report other damage to organizational

maintenance.

Air cleaner

If restriction indicator shows restric-

Paragraph 4-18

tion, report it to organizational main-

tenance.

Unusual noises

Shut down pump and report trouble to

or vibration

organizational maintenance.

Fuel, lubricant,

Report troubles to organizational main-

and coolant

tenance.

leaks.

Section IV. TROUBLESHOOTING

this chart. If the corrective actions given in this chart do

3-5. General

not correct the malfunction, report the trouble to

This section describes troubles which might occur

organizational maintenance.

during operation of the centrifugal pump, along with the

3-6. Operator/Crew Troubleshooting Chart

probable causes and corrective actions relating to the

Refer to table 3-2 for troubleshooting which is

troubles. Only those malfunctions which are within the

allocated to the operator/crew level of maintenance.

maintenance scope of the operator/crew are included in

Table 3-2. Troubleshooting Chart

Malfunction

Probable cause

Corrective action

1. Engine fails to turn over.

a. Battery dead.

a. Jumper battery or recharge weak

battery. Report to organiza-

tional maintenance if battery

fails to retain charge.

b. Battery disconnect in OFF posi-

b. Operate battery disconnect to

tion.

ON (18, fig. 2-2).

c. Starter defective.

c. Report to organizational mainte-

nance.

2. Engine turns over but fails to start. a. Fuel tank empty.

a. Fill fuel tank (para 2-10j).

b. Choke not pulled out.

b. Pull out choke (8, fig. 2-2).

c. Water in fuel.

c. Drain fuel tank and lines. Refill

with fresh fuel.

d. Overspeed governor not reset af-

d. Reset overspeed governor (para

ter overspeed shutdown.

2-10h).

3. Engine starts but then stops.

a. Insufficient fuel supply.

a. Fill fuel tank (para 2-10j).

b. Contaminated fuel.

b. Drain fuel system and refill with

fresh fuel.

c. Choke pulled out.

c. Push in choke control (8, fig. 2-2).

d. Water temperature safety switch

d. Check cause of engine overheat-

trips.

ing. Report to organizational

maintenance.

3-2