Table 1. Maintenance Indicator Checklist--Continued.

TM 10-3930-222-20

Table 1. Maintenance Indicator Checklist--Continued.

Item

Interval

Par.

No.

Procedure

ref.

c. Check the ammeter. A slight charge should be indicated at

normal operating speed.

d. The fuel gage should register full.

e. The hour meter should operate as soon as the engine is operating.

f. The transmission temperature gage will indicate red if trans-

mission exceeds safe operating range.

g. The horn should be audible for a distance of 300 feet.

h. Check all switches for efficient operation, secure mounting, and

positive operation.

Engine.

Observe engine operating characteristics, such as noise, engine

knocks, and rattles while the engine is accelerated and decelerated.

Fuel Pump.

a. Inspect the fuel pump for leaks and other defects

b. Perform-a static pressure test on the fuel pump (par. 29).

Governor.

Adjust governed speed to 2,400 rpm without load and 2,200 rpm

with full load.

Ignition Timing.

Check ignition timing. Adjust the timing as necessary.

44e

Compression Test.

a. Perform a compression test.

b. Remove and completely service spark plugs. Adjust gap to 0.030

inch, and torque plugs to 10 to 20 foot-pounds.

Vacuum Test.

Perform a vacuum test and adjust carburetor.

Voltage Regulator.

Check the voltage regulator for proper voltage output of 13.8 to

14.8 volts, and proper current output of 17.5 to 20.8 amperes.

Steering.

With engine turned off, install pressure gage in proper opening

on relief valve (located in flow divider). Operate engine at 600 rpm

steer wheels to extreme right or left and hold them in this position,

and check line pressure. The pressure reading should be 1,200 psi.

Main Hydraulic Pump.

Inspect the main hydraulic pump for leaks. Be certain that it is

mounted securely.

Main Hydraulic Pump.

With engine turned off, install pressure gage at the proper open-

ing in the control valve. Operate engine at top governed speed, tilt

mast assembly against rear stops, and check output pressure reading.

The proper reading's 1,800 psi.

Hydraulic Cylinders.

a. Lift Cylinder. Place a 15,000-pound load on the forks, and

raise load from ground level to a lift height of 210 inches. The load

should reach this height it in approximately 22 seconds. Lower the

load to 4 or 5 feet above ground level. Hold load in this position for

5 minutes. At the end of 5 minutes, the load should not have drifted

more than 1 inch. Check cylinder for leaks.

b. Tilt Cylinders. Tilt the load at the lift height of 210 inches.

Perform this operation several times and note any malfunctioning.

Check cylinders for leaks. Tilt should not exceed 3o forward or 10o

backward from center.