Section 6. CORRECTIVE MAINTENANCE

SECTION 6

CORRECTIVE MAINTENANCE

6-1.

GENERAL.

............................................................ 500 amps

Power steering motor

6-2. This section provides information useful in

field coil

diagnosing and correcting unsatisfactory operation or

resistance at 70 deg F .... series 0.0190 ohms 10%

failure of the fork lift truck. Included are troubleshooting

..........................................shunt 16 ohms 10%

information, removal and replacement procedures, and,

finally, general overhaul procedures. The procedures

include adjustments where required.

Travel motor voltage (nominal) ......................... 36 volts

6-3.

CHARACTERISTICS AND RATINGS.

Travel motor horsepower

rating at 36 volts ..............................5.2 hp (approx)

6-4. ELECTRICAL COMPONENTS.

Electrical

characteristics of fork lift truck useful to maintenance is

Travel motor speed

as follows:

at 36 volts with

20 foot pound load ..............................890 rpm 5%

Hydraulic pump motor

Travel motor current

voltage (nominal) ........................................ 36 volts

at 36 volts with

20 foot pound load ............................. 75 amps 5%

Hydraulic pump motor

Travel motor stalled

horsepower rating at 36 volts ............................3 hp

rotor torque at 36 volts .......................... 230 ft lbs at

............................................................ 550 amps

Hydraulic pump motor

Travel motor field

coil resistance at 70 deg F .......... 0.021 ohms 10%

speed at 36 volts with

33 foot pound load ............................1600 rpm 5%

Accelerator switch

Hydraulic pump motor

potentiometer resistance ................ 0 to 6,000 ohms

current at 36 volts

with 33 foot pound load .................... 250 amps 5%

Accelerator controller

potentiometer resistance

Hydraulic pump motor

with starting contactor

stalled rotor torque

energized (shaft rotated

at 36 volts ............................... 60 ft lbs at 400 amps

approximately 7 deg) ............................... 300 ohms

Hydraulic pump

Accelerator controller

motor field coil

potentiometer resistance

resistance at 70 deg F ................. 0.006 ohms 10%

with final switch actuated

(shaft rotated approximately 27 deg .. 30 ohms max.

Power steering motor

voltage (nominal) ........................................ 36 volts

Directional switch type .......................................... DPDT

Power steering motor

Pump motor relay type ......................................... SPST

horsepower rating at 36 volts ............................1 hp

Pump motor relay coil

resistance at 70 deg F ................... 30.2 ohms 10%

Power steering motor

speed at 36 volts with

2 foot pound load ..............................2700 rpm 5%

Master switch relay type ....................................... SPST

Power steering motor

Master switch relay

coil resistance at 70 deg F ............ 30.2 ohms 10%

current at 36 volts with

2 foot pound load ............................... 30 amps 5%

Forward relay type ............................................... SPDT

Power steering motor

stalled rotor torque

Forward relay coil

resistance at 70 deg F ................... 25.3 ohms 10%

at 36 volts ............................................... 67 ft lbs at

6-1