Specifications.

(g) Remove screws securing battery

motor and is supported on each end by mounting

brackets which are secured to the lift truck frame. The

acid tray and remove tray.

(h) Unsnap band assembly from around

pump motor is activated through microswitches

whenever the key switch is in the ON position and the lift

pump motor housing and remove band.

or tilt levers are operated. Hydraulic pump motor

(i) Remove brush shunt retaining

specifications are as follows:

screws.

b. Specifications.

(j) Lift brush retaining springs and

Power ....................................... 10.7 hp

remove brushes from brush holders.

Speed .................................... 1950 rpm

(k) Install wheel chocks forward and aft

Voltage .....................................36 volts

of front wheels to prevent lift truck from moving.

Amperage ........................ 260 amperes

(I) Using a suitable lifting device, raise

rear end of lift truck above the ground sufficiently to gain

c. Brush and Brush Holder Service. Dual pump

access to lower pump motor brushes. Install blocking

motor brushes of high current-carrying capacity are

under truck.

(m) Remove brush shunt retaining

precision fitted into broached brush boxes to insure

proper brush alignment. A metal clip located on top of

screws.

(n) brush retaining springs and remove

each brush provides a seat for the spring and also forms

a stop device that prevents commutator scoring should

brushes from brush holders.

brushes become excessively worn. Brushes require

(2) Installation of Brushes.

replacement when their length is 9/16 inch or less.

Note. Before installing new brushes into

Pump motor brushes may be changed without difficulty

pump motor, insure that brushes are contoured to match

whenever pump motor has been removed from lift truck,

radius and brush angle of brushes removed during

however, brushes may be changed if pump motor is

removal procedure. Check brush spring tension. It

should be 25 ounces : 20%.

installed on lift truck by performing the following. (fig. 3-

32.)

Note. Final seating of brushes can be

accomplished using a fine mesh seating stone while

commutator is rotating.

(a) Using a sanding drum with the same

diameter as pump motor commutator, hold new brush

against sanding drum until brush contact face resembles

old brush contact face.

(b) Repeat step (a) for each new pump

motor brush to be installed.

reverse order of removal procedure.

d. Removal. For repair, beyond brush holder

service, remove the hydraulic pump motor according to

paragraph 2-15.

e. Disassembly. Disassemble pump motor as

follows:

(1) Remove thermal relay from stator housing

ITM 10-3930-620-12).

(2) Remove screws securing mounting

brackets (4 and 20, fig. 3-33) and remove brackets.

Figure 3-32. Hydraulic pump motor brush location.

(3) Remove front and rear bands 1 and 2)

(1) Removal of Brushes.

from pump motor.

(a) Disconnect battery and discharge

(4) Remove brush shunt retaining screws.

capacitors (para 2-5).

(5) Lift brush retaining springs (15) and

(b) Raise operator's seat by pulling

remove brushes (16) from brush holders (13).

forward to gain access to battery compartment.

(6) Remove remaining screws securing front

housing (3) to stator (391 and remove housing.

lifting up and pulling back on the handle.

Caution:

Use extreme care when

(d) battery side panels by lifting up and

removing armature to prevent damaging core,

removing from lift truck.

commutator, or pole faces. Insure that armature is

(e) a chain hoist, remove battery from

battery compartment.

pulled straight up and out of stator.

(f) Remove screws securing battery

retainer and remove retainer.

3-53