ELECTRICAL COMPONENTS

valve type .................................................... 2 spool

Reverse relay type ............................................... SPDT

Reverse relay coil

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

Tilt cylinder bore .....................................................4 in.

Tilt cylinder stroke ............................................ 3.125 in.

Shorting contactor

relay type ....................................................... SPST

Tilt cylinder closed

Shorting contactor relay

length ....................................................... 13.000 in.

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

Lift cylinder ........................................... extended length

- dual ..................................................... 113.594 in.

Field weakening relay type ................................... SPST

- triple .................................................... 129.375 in.

Field weakening relay type

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

Lift cylinder

closed length

Steering relay type ............................................... SPST

- dual ....................................................... 65.469 in.

Steering relay coil

resistance at 70 deg F ................... 46.9 ohms 10%

- triple ...................................................... 78.625 in.

6-6. MECHANICAL COMPONENTS. .....The pertinent

Field weakening pack

mechanical data is as follows:

(FWP) resistance at 70 deg F

Steering gear ratio ................................................17.5:1

(across terminals 1 and 2) ...... 50,000 ohms dropout

Steering wheel rotation

.......................................... 100,000 ohms pickup

(lock to lock) .......................................... 4.122 turns

Transformer IT primary

resistance ....................................... 0.000835 ohms

Drive axle type ....................................double reduction,

.................................................................. 10%

.................................................... ring and pinion

Transformer IT secondary

........................................................ plus internal

resistance ........................................... 0.0755 ohms

........................................................ to sun gears

.................................................................. 10%

Drive axle

Field weakening

over-all reduction

resistance (FW RES) .................. 0.019 ohms 10%

(including adapter) .......................................12.75:1

Resistor 1 RES

Drive axle

resistance ........................................ 75 ohms 10%

pinion gear backlash ...................................0.005 to

Resistor 2 RES

.............................................................. 0.015 in.

resistance ........................................ 4 ohms 10%0

Drive axle

Resistor 3 RES

bevel gear reduction ......................................41/9:1

resistance ........................................ 40 ohms 10%

Drive axle

brake type ................................................. hydraulic

6-5. HYDRAULIC COMPONENTS. ....... The hydraulic

............................................................drum type

characteristics are as follows:

6-7. WEAR LIMITS AND CLEARANCES.

Hydraulic fluid type ..................................... MIL-L2104B

6-8. Table 6-1 lists wear limits and clearances

Hydraulic fluid viscosity ..................................... SAE-10

applicable during overhaul of components.

Hydraulic fluid capacity ....................................... 8 gals.

6-9.

TROUBLESHOOTING.

Hydraulic system

6-10. PROCEDURES.

pressure relief setting ............................... 1800 psig

Hydraulic pump capacity

6-11. The first step in any trouble-shooting procedure

at 1200 rpm and

is to determine the exact symptom. If the symptom

1000 psig ..................................................8.76 gpm

involves true motion, start by jacking up the truck so that

Hydraulic pump rotation

the drive wheels are off the floor. From the actual

(facing shaft) ................................................... CCW

symptom

Direction control

6-2