MOTOR BRUSH REPLACEMENT.

lockwasher.

(2) Using procedure appropriate to the

6-55.

RELAY CONTACT REPLACEMENT.

charger being used, adjust initial charging rate for a fully

discharged battery to 130 to 160 amperes.

6-56.

Relay contact maintenance is restricted to

those relays having contacts visible for inspection and

(3) At end of charging time disconnect

replaceable without removing the relays. Contacts

charger and observe cell vent caps for signs of

require replacement when the silver has worn down to

excessive gassing.

This is usually indicated by

the steel support.

electrolyte around the fill hole of the cell.

a. Removal.

(1) Remove control panel cover (para. 6-28).

6-51.

WIRING HARNESS.

(2) Remove nuts holding contacts to be

removed. Remove contacts from relay.

6-52.

Repair of the wiring harness is limited to

isolating shorted and open circuits and using good

b. Installation. Put new contacts in position and

commercial practice in their repair. Refer to the wiring

install nuts. No special check or adjustment is needed

diagram (figure 42) and conduct a systematic inspection

after installation.

using an ohmmeter to isolate the trouble. Remedy the

trouble by splicing leads where required and applying

6-57.

FUSE AND FUSETRON REPLACEMENT.

electrical tape to prevent short circuits from occurring.

Removal.

(1) Remove fuse access cover (para. (629).

6-53.

MOTOR BRUSH REPLACEMENT.

(2) Loosen screws securing fusetron to fuse

6-54.

Motor brush replacement for the travel motor

panel and slide fusetron off fuse panel.

(figure 7-36), power steering motor (figure 7-32) or

hydraulic pump motor (figure 7-15) is the same.

(3)

Pull fuses straight off fuse panel.

a. Removal.

(1) Remove screw, nut and lockwasher

b. Installation. Reverse applicable procedures in

securing brush covers to motor housing and remove

a. above to replace fusetrons and fuses.

brush covers.

6-58.

DIRECTIONAL CONTROL SWITCH.

(2) Remove screw and lockwasher securing

brush leads.

6-59.

Maintenance of the directional control switch

(figure 7-12) consists of replacing terminal switches.

(3) Pull back on brush spring sufficiently to

The switch need not be removed.

release brush and pull brush out of brush holder.

a. Removal.

(1) Remove cover attaching screws (12) and

(4) Repeat steps (1) through (3) for removal

washers (13) and remove cover (11).

of remaining brushes.

(2) Disconnect and tag leads from switch

b. Inspection. Compare length of used brush with

terminals (18).

length of a new brush from stock. Replace any brush

worn to half (or less) the length of new brush, as given

(3) Remove switch attaching screws and nuts

below.

and remove switch.

Installation.

Installation. Reverse procedure in a. above.

(1) Install new brushes in brush holders with

short side of brush toward spring side of holder so brush

6-60.

PUMP MOTOR SWITCH.

friction surface contour mates with surface of armature

Removal.

commutator. If brush edge meets commutator, reverse

(1) Remove valve cover (para. 6-30).

brush in holder. Fasten brush leads to holder with

removed screws and lockwashers.

(2) Disconnect and tag leads at switch (60,

figure 7-2) loosen jamnut and screw switch out of switch

(2) Hook brush springs over brushes and

bracket.

check pressure exerted on brush with a pull scale. Pull

should be 26 ounces to 32 ounces at time scale lifts

b. Installation. Reverse procedures in a. above,

spring from brush on either motor.

turning switch in switch bracket to point where switch is

actuated when either the tilt or hoist lever is operated.

(3) Install brush covers and secure in position

Lock with jamnut.

on motor housing with removed screw, nut and

6-21