Forward and Reverse Contactors

TM 10-3930-631-34

spring (11) and remove carrier (12) from armature.

(4) Install armature over coil on yoke and install

Remove pivot bearing (13).

armature retainer (33) and secure with screws (31) and

(6) Remove spring (16) from coil (17). Remove

washers (32).

screw (18) and washer (19) and remove coil (17) from

(5) Install contacts (3) in carrier and support and

yoke.

secure with screws (1) and lock washers (2).

d. Cleaning, Inspection and Repair.

f. Check Contact Point Gap.

(1) Refer to figure 9-13 and check contact point

WARNING

gap.

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

(2) Pump contactor normally open contacts

680), used for cleaning, is potentially dangerous

should have an air gap of 0.280 to 0.400 inch (7.11 to

to personnel and property. Do not use near open

flame. Flash point of solvent is 100F to 138F

10.1 mm).

(3) Emergency cutout contactor points should

(38C to 59 C).

have an air gap of 0.160 to 0.280 inch (4.06 to 10.1 mm).

(1) Clean all metal parts in cleaning com-

(4) Loosen screws and adjust contact point air

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

gaps to tolerances shown.

(2) Inspect components for wear or damage that

(5) Refer to paragraph 9-26 g and check

may prevent or impair normal operation. Replace

contactor coil operation.

unserviceable parts.

g. Installation. Refer to paragraph 9-23 and install

(3) Check for cracked or frayed electrical leads.

pump and emergency cutout contactors on contactor

Repair or replace as necessary.

panel.

(4) Check contactor points for signs of arcing

9-26. Forward and Reverse Contactors

and pitting. Replace worn or pitted contacts.

a. General. The forward and reverse contactors

(5) Check springs for cracks, damage and lack

each have two sets of contacts, four contacts in all. Two

of tension. Replace unserviceable springs.

are normally closed and two normally open. The two

e. Assembly.

contactors are connected together with a bus bar (69, fig.

(1) Install core (20, fig. 9-22) in coil (17). Install

9-21).

coil (17) on yoke (30) and secure with screw (18) and

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

washer (19). Install spring (16) in core.

forward and reverse contactors from contactor panel.

(2) Install block (29) on yoke (30) and secure

c. Disassembly.

with screws (27) and washers (28). Install bracket (26)

(1) Remove screws (1, fig. 9-23), lock washers

and support (23) on block and secure with screws (21

(2) and dished washers (3) and remove contacts (4) from

and 24) and washers (22 and 25).

carrier and supports.

(3) Install pivot bearing (13) in armature (15).

Install carrier (12) on armature and secure with spring

(11), cup (10) and cotter pin (9).

9-35