SECTION V INSPECTION, MAINTENANCE AND LUBRICATION

TM 10-3930-623-12

SECTION V

INSPECTION, MAINTENANCE AND LUBRICATION

which should normally indicate a pressure of 20 to 30 psi

5-1. SCOPE OF SECTION.

at governed speed when engine is warm. If there is no

5-2.

This section contains instructions for periodic

oil pressure indication, or the pressure is unsteady after

inspection of the fork lift truck, maintenance which can

the engine has operated for 30 seconds, stop the engine

be performed with commonly available hand tools,

and determine the cause. With engine fully warmed up,

lubrication instructions, and a table of the service

oil pressure should never be below 7 psi at idle speed.

troubles most likely to be encountered, and their

remedies. No special tools are required to accomplish

2. When the engine is started, the ammeter will

any of the operations in this manual.

normally indicate a high charging rate and then gradually

return to a slight charging rate. If a discharge indication

5-3. PREVENTIVE MAINTENANCE SERVICES. To

or absence of indication is noted, stop the engine and

ensure that the fork lift truck is ready for operation at all

investigate the cause.

times, it must be inspected systematically so that defects

may be discovered and corrected before they result in

3. The normal engine temperature range (after

serious damage or failure. The necessary preventive

warm-up) should be between 165 degrees to 190

maintenance checks and services to be performed are

degrees F.

If the temperature gage indicates

listed as described in paragraphs 5-4 and 5-8. The item

temperature outside these limits, stop the engine and

numbers indicate the sequence of minimum inspection

investigate the cause. Low coolant level is the most

requirements. Defects discovered during operation of

common cause of overheating, while a defective

the unit will be noted for future correction, to be made as

thermostat will cause overcooling.

soon as operation has ceased.

Stop operation

immediately if a deficiency is noted during operation

4. Operation. Check engine at various speeds for

which would damage the equipment if operation were

evidence of overheating, lubricant leakage and other

continued. All deficiencies and shortcomings will be

abnormal conditions.

Note any excessive noise or

recorded together with the corrective action taken (on

vibration of the engine over its entire speed range.

DA Form 2028) at the earliest possible opportunity.

5. Transmission. Place the fork lift truck in motion

5-4.

PREVENTIVE MAINTENANCE CHECKS AND

and check operation of transmission in forward and

SERVICES.

Refer to table 5-3 and perform the

reverse.

The transmission shift lever should slide

preventive maintenance checks and services on the fork

smoothly into position without a tendency to slip out of

lift truck.

gear. Note any excessive vibration of shift lever when

decelerating or accelerating the vehicle.

5-5. DELETED

6. Service and Hand Brakes. Test operation of

5-6.

EIGHT HOUR OPERATIONAL INSPECTION

service brakes at start of road test while traveling at

(ROAD TEST). Road tests on the fork lift truck should

various vehicle speeds. Brake action should be positive

also be conducted following maintenance and service

and applied equally to both front wheels. Note any

operations.

Periodic road tests should also be

mushiness or creeping of the brake pedal or tendency of

scheduled if the vehicle is subjected to infrequent use.

the wheels to lock, pull to one side or produce unusual

The road test should provide sufficient operational time

noises. Test the hand brake with the vehicle on an

to insure proper operation of the vehicle.

Before

incline, noting if the brakes hold the vehicle satisfactorily.

attempting to drive the vehicle, but while the engine is

operating, check the operation of the brakes, steering

7. Steering. Check the steering wheel travel for

wheel, truck lighting system and hydraulic system in

hard steering, poor return to center and noises.

accordance with their respective operating instructions.

When the engine is started, observe the indicating

8. Upright Assembly Hydraulic System (see figure

instruments and perform inspection as described in the

1-4). Check the hydraulic system by testing operation of

subsequent steps:

both the tilt and hoist cylinders through their complete

range of movement. Pushing the control valve handle

1. Observe the oil pressure gag e (figure 1-12)

marked HOIST

5-1