JF Series Starting Motor Caterpillar

Illustration 1	g00719179

Illustration 2	g00719193

Rated Voltage ... 12 volts

Solenoid resistance

Pull-in winding ... 0.24 ± 0.01 ohms

Hold-in winding ... 1.05 ± 0.05 ohms

Minimum engaged solenoid voltage

Pull-in winding ... 5 volts

Hold-in winding ... 8 volts

No load test

Minimum voltage ... 10.5 volts

Minimum speed ... 7800 rpm

Maximum current draw ... 170 amp

Load test

Minimum voltage ... 9.2 volts

Minimum speed ... 1600 rpm

Maximum current draw ... 1000 amp

Maximum torque ... 24 N·m (18 lb ft)

(1) Put 9S-3263 Thread Lock Compound on the threads of the solenoid mounting screws. Torque for the screws ... 4.6 to 6.0 N·m (41 to 53 lb in)

(2) Torque for M10 terminal nuts ... 28 ± 4 N·m (21 ± 3 lb ft)

(3) Torque for M4 terminal nut ... 1.0 to 1.3 N·m (8.8 to 11.5 lb in)

(4) Required pressure for the brush spring

New ... 46 N (10.3 lb)

Minimum ... 26 N (5.8 lb)

(5) Brush length

New length ... 15.5 mm (0.61 inch)

Minimum length ... 8.5 mm (0.33 inch)

(6) Armature end play ... 0.05 to 0.40 mm (0.002 to 0.016 inch)

(7) Put 9S-3263 Thread Lock Compound on the threads of the center cover screws. Torque for the screws ... 3.2 to 4.0 N·m (28 to 35 lb in)

(8) Armature total indicator runout (TIR)

Commutator ... 0.03 mm (0.001 inch)

Laminated core ... 0.10 mm (0.004 inch)

(9) Put 9S-3263 Thread Lock Compound on the threads of the field winding screws. Torque for the screws ... 37 to 53 N·m (27 to 39 lb ft)

(10) Commutator

New diameter ... 45 mm (1.77 inch)

Minimum diameter ... 42.5 mm (1.67 inch)

Minimum depth of insulation between commutator bars ... 0.8 mm (0.03 inch)

(11) Put 9S-3263 Thread Lock Compound on the threads of the starting motor through bolts. Torque for the end cover nuts ... 9.1 to 12.2 N·m (80.5 to 108 lb in)

Put 9S-3263 Thread Lock Compound on the threads of the shift lever screw. Torque for the shift lever nut (not shown) ... 9 to 11 N·m (80 to 97 lb in)

Starting motor weight ... 12.5 kg (27.5 lb)