Section XIV. REPAIR OF ACCELERATOR CONTROLLER

TM 10-3930-609-35

Connect motor electrically as shown in figure 3-19.

u. Using a high potential test set, apply 500 volts

Check motor at no load and at stalled rotor load for

ac rms between terminal A2 and motor frame for one

characteristics shown in the following chart.

minute. There must be no evidence of insulation

breakdown.

3-98. Installation of Pump Motor

v. Clamp motor securely to top of bench and

Refer to paragraph 2-22 for installation procedure.

connect a torque arm (capable of applying no load to

stall load) to armature shaft and to a spring balance.

Voltage

Loading

Applied torque

Motor speed

Current

(steady)

36 volts dc Equivalent to raising 2,000 pound load

14 foot pounds

3,265 rpm 5%

200 amps 5%

on forks

36 volts dc Stalled rotor

42 foot pounds minimum

525 amps 5%

Section XIV. REPAIR OF ACCELERATOR CONTROLLER

3-99. Description of Accelerator Controller

e. Remove screws and lockwashers which secure

The accelerator controller comprises a metal switch

controller to mounting bracket and separate controller

enclosure mounted on a welded steel bracket. The

from bracket.

bracket provides the mounting for the controller below

f. Remove screws and lockwashers which secure

the accelerator pedal. A shaft extending from the

cover to controller box assembly; then, remove cover to

enclosure is mechanically connected to the accelerator

expose parts inside box assembly.

pedal through a lever and control rod. A return spring-

g. Remove screws which mount support to box

(attached to the lever) returns the controller mechanism

assembly; then, lift out support with potentiometer and

to the off position when the operator removes force from

terminal block.

the accelerator pedal. Inside the enclosure, two cams

h. Disconnect potentiometer leads from terminal

attached to the shaft operate sensitive switches as the

board; then, remove clamp and pinion from

shaft is rotated through the accelerator pedal linkage. A

potentiometer shaft.

Remove nut from hub of

sector gear mounted on the shaft rotates the shaft of a

potentiometer and withdraw potentiometer from

potentiometer mounted in the enclosure. A mechanical

potentiometer bracket.

stop secured to the shaft limits shaft rotation in both

i. Ordinarily, removal of terminal boards, terminal

directions.

board bracket and potentiometer bracket will not be

required.

3-100. Removal of Accelerator Controller

j. Remove screws which secure switch supports to

Removal of the accelerator controller from the truck is

box assembly; then, remove screws which secure,

required for repair as described in the following

switches to switch supports and withdraw switches.

instructions. Refer to TM 10-3930-609-12 for removal

procedure.

k. Loosen setscrew in stop, in gear sector hub and

in collar and remove screws and lockwashers from

3-101. Disassembly of Accelerator Controller (fig. 3-

cams; then, withdraw shaft from box assembly and

20)

remove two keys.

a. Loosen nut on rod and unscrew rod from ball

I. Remove collar, hub, gear sector, cams and stop

joint.

from box assembly.

b. Remove screw and lockwasher which secure

ball joint to lever and remove ball joint.

3-102. Cleaning Disassembled Parts of Accelerator

Controller

c. Disconnect' spring from capscrew inside of lever

and remove capscrew and nut from lever.

a. Wash metallic non-electrical parts, if required, in

SD and dry with compressed air under moderate

d. Remove capscrew, nut and lockwasher which

pressure.

secure lever to shaft of controller and disengage lever

from shaft.

b. Clean electrical parts by wiping with a soft cloth.

3-35