Hydraulic Pump and Emergency Cutout Contactors

TM 10-3930-631-34

(4) Remove transformer (19), standoffs and

(2) Install insulator (70) and emergency cutout

spacers.

contactor (79 fig. 9-21) and secure to panel (75) with

(5) Remove fuses (10) and fuseholders (11).

screws (50), washers (51) and lock washers (52).

Remove screws (12) and lock washers (13) and remove

Tighten screws securely.

support (14).

(3) Install insulators (70) and forward and

(6) Remove screws (9) and remove resistor and

reverse contactors (77 and 78) on plate and secure with

diode assembly (80). Refer to paragraph 9-27 for repair

screws (67), washers (68) and lock washers (69).

of diode and resistor assembly.

Tighten screws securely.

(7) Remove screws (38), washers (39), lock

(4) Install insulator (70) and install pump

washers (40) and nuts (41) and remove diode

contactor (81). Secure contactor with screws (64), lock

suppressor module (42). Remove screws (43) and

washers (65) and washers (66).

remove support (44).

(5) Install bus bars (59 and 63) and terminals

(8) Remove screws, washers and lock washers

(54) on forward and reverse contactors and secure with

and remove bus bars (59 and 63) and terminals (54)

screws.

from forward and reverse contactors (77 and 78).

(6) Install support (44) on panel and secure with

(9) Remove screws (67), washers (68) and lock

screws (43). Install diode suppressor module (42) on

washers (69) and remove forward and reverse

support and secure with screws (38), washers (39), lock

contactors. Remove insulators (70). Refer to paragraph

washers (40) and nuts (41). Tighten nuts securely.

9-26 for repair of contactors.

(7) Install diode and resistor assembly (80) on

(10)Remove screw (50), washers (51) and lock

panel and secure with screws (9). Tighten screws

lashers (52) and remove emergency cutout contactor

securely.

(79). Refer to paragraph 9-25 for repair of contactor.

(8) Install fuse support (14) on panel and secure

(11)Remove screws (64), lock washers (65) and

with screws (12) and lock washers (13). Install fuse

washers (66) and remove pump contactor (81).

holders (11) and fuses (10) in support.

(12)Harness, cables, and items 27 through 32

(9) Install standoffs (20) and spacers (21) and

are removed when wires are disconnected.

install bus bar (55) on panel. Secure standoffs with

(13)Remove plate (71) and remove screws (72)

screws (76).

and lock washers (73) and remove shelf (74) from panel

(10)Install standoffs (20) and spacers (21) and

(75).

install transformer (19) on standoffs. Secure transformer

d. Cleaning, Inspection and Repair.

and one 400 amp fuse (46) to bus bar. Install remaining

400 amp fuse on bus bar.

WARNING

(11)Install standoffs (20) and spacers (21) and

Cleaning compound, solvent (Fed. Spec. P-D-

connect 35 amp fuse (45) to bus bar.

680), used for cleaning, is potentially dangerous

(12)Install studs (32), insulators, nuts and

to personnel and property. Do not use near open

flame. Flash point of solvent is 100 F to 138

washers in shelf.

(13)Install wiring harness (8) through shelf and

F(38 C to 59 C).

secure with connector (7).

(1) Clean all metal parts in cleaning com-

(14)Refer to figures 9-19 and 9-20 and connect

pound, solvent (Fed. Spec. P-D-680) and dry thoroughly.

contactor panel cables and wiring harness to

(2) Inspect all components for wear and

components.

damage which may impair or prevent normal operation.

f. Installation. Refer to paragraph 2-16 and install

(3) Inspect harness and cables for cracked or

contactor panel on truck. Operate truck and check

frayed wires or cables. Repair by taping or insulating, if

contactor and control operation. Truck should operate

possible. Replace unserviceable components.

smoothly and properly through all phases of movement.

(4) Check all fuses with a test lamp. Replace

9-25. Hydraulic Pump and Emergency Cutout

blown fuses.

Contactors

(5) Test diode suppressor module as outlined in

a. General. Contactors control operation of the

paragraph 9-17. If readings are not as indicated, replace

drive motor, pump motor and emergency cutout. The

diode suppressor module.

contactors are mounted in the contactor panel (fig. 2-7).

(6) Replace all unserviceable components.

b. Removal. Refer to paragraph 9-24 and remove

e. Assembly.

contactors from contactor panel.

(1) Install shelf (74, fig. 9-21) on panel (75) and

c. Disassembly. The hydraulic pump and

secure with screws (72) and lock washers (73). Install

plate (71).

9-33