C7 Industrial Engines Specifications – Electric Starting Motor

S/N – JRA1-UP
S/N – JTF1-UP

When the electric starting motor is viewed from the drive end, the motor rotates in the following direction. … Clockwise

No load conditions at 25 °C (77 °F)

Maximum speed … 4200 rpm
Maximum current … 220 Amp
Voltage … 11 VDC

Note: A maximum of three cable terminals or wire terminals may be used with the battery terminal nut (1) . A maximum of two of the cable terminals may be equal to or greater than 0 AWG.

(1) Final installation torque for the ground terminal nut … 26.0 ± 3.5 N·m (230 ± 30 lb in)

(2) Final installation torque for the battery terminal nut … 26.0 ± 3.5 N·m (230 ± 30 lb in)

(3) Final installation torque for the motor terminal nut … 25 ± 7 N·m (220 ± 60 lb in)

(4) Final installation torque for the switch terminal nut … 2.25 ± 0.25 N·m (20 ± 2 lb in)

Current draw at 12 V and 25 °C (77 °F)

Pull-in windings … 90 Amp
Hold-in windings … 30 Amp

When the electric starting motor is viewed from the drive end, the motor rotates in the following direction. … Clockwise

No load conditions at 25 °C (77 °F)

Speed … 3638 ± 413 RPM
Current … 90 ± 16 ampere
Voltage … 23 V
(1) Tighten the nut on the battery terminal to the following torque. … 30.5 ± 3.5 N·m (22 ± 3 lb ft)

(2) Tighten the nut on the ground terminal to the following torque. … 30.5 ± 3.5 N·m (22 ± 3 lb ft)

(3) Tighten the nut on the switch terminal to the following torque. … 2.25 ± 0.25 N·m (20 ± 2 lb in)

Note: The switch terminal must be insulated with heat shrink tubing. Do not use molded terminals.

(4) Tighten the nut on the motor terminal to the following torque. … 14.7 ± 3.4 N·m (11 ± 3 lb ft)

Note: The internal Torx screw must be held during tightening or loosening of the nut.

(5) Tighten the nut on the motor frame terminal to the following torque. … 8 ± 3 N·m (70 ± 27 lb in)

Electric starting motor solenoid

Current draw at 20 V and 25 °C (77 °F)

Pull-in windings … 36 amp
Hold-in windings … 6 amp
Mounting Positions

(A) The electric starting motor must be engine mounted with the start solenoid: … 15° minimum above horizontal

(B) Allowable range

When the electric starting motor is viewed from the pinion end, the motor rotates in the following direction. … Clockwise

No load conditions at 25 °C (77 °F)

Speed … 6900 ± 1800 rpm
Current … 150.5 ± 27.5 Amp
Voltage … 11 VDC
(A) Clearance between the pinion and the housing … 9.1 mm (0.36 inch)

(1) Final installation torque for the ground terminal nut … 30.5 ± 3.5 N·m (270 ± 30 lb in)

Note: A maximum of three cable terminals or wire terminals may be used with the battery terminal nut (2). A maximum of two of the cable terminals may be equal to or greater than 0 AWG.

(2) Final installation torque for the battery terminal nut … 30.5 ± 3.5 N·m (270 ± 30 lb in)

(3) Final installation torque for the ground terminal nut … 2.25 ± 0.25 N·m (20 ± 2 lb in)

Note: The switch terminal must be insulated with heat shrink tubing. Do not use molded terminals.

(4) Final installation torque for the switch terminal nut … 2.25 ± 0.25 N·m (20 ± 2 lb in)

(5) Final installation torque for the motor terminal nut … 30.5 ± 3.5 N·m (270 ± 30 lb in)

(6) Final installation torque for the bolt for the motor frame terminal … 8 ± 3 N·m (70 ± 27 lb in)

Solenoid kit

Current draw at 10 V and 25 °C (77 °F)

Pull-in windings … 97 Amp
Hold-in windings … 18 Amp
Maximum rated current … 1600 Amp


When the electric starting motor is viewed from the drive end, the motor rotates in the following direction. … Clockwise

No load conditions at 25 °C (77 °F)

Speed … 7018 ± 1517 rpm
Current … 147.0 ± 27.5 Amp
Voltage … 11 VDC
(A) Clearance between the pinion and the housing … 1.02 ± 0.76 mm (0.040 ± 0.030 inch)

Note: A maximum of three cable terminals or wire terminals may be used with the battery terminal nut (1) . A maximum of two of the cable terminals may be equal to or greater than 0 AWG.

(1) Final installation torque for the battery terminal nut … 30.5 ± 3.5 N·m (270 ± 30 lb in)

(2) Final installation torque for the ground terminal nut … 30.5 ± 3.5 N·m (270 ± 30 lb in)

(3) Final installation torque for the ground terminal nut … 2.25 ± 0.25 N·m (20 ± 2 lb in)

Note: The switch terminal must be insulated with heat shrink tubing. Do not use molded terminals.

(4) Final installation torque for the switch terminal nut … 2.25 ± 0.25 N·m (20 ± 2 lb in)

(5) Final installation torque for the motor terminal nut … 8 ± 3 N·m (70 ± 27 lb in)

(6) Final installation torque for the bolt for the motor frame terminal … 8 ± 3 N·m (70 ± 27 lb in)

Solenoid kit

Current draw at 10 V and 25 °C (77 °F)

Pull-in windings … 74 Amp
Hold-in windings … 19 Amp
Maximum rated current … 1400 Amp

When the electric starting motor is viewed from the drive end, the motor rotates in the following direction. … Clockwise

No load conditions at 25 °C (77 °F)

Speed … 7200 ± 1250 rpm
Current … 82.5 ± 17.5 Amp
Voltage … 23 V
Note: A maximum of three cable terminals or wire terminals may be used with the battery terminal nut. A maximum of two of the terminals may be equal to or greater than 0 AWG.

(B) Clearance between the pinion and the housing assembly … 4.6 mm (0.18 inch)

(1) Final installation torque for the battery terminal nut … 30.5 ± 3.5 N·m (22 ± 3 lb ft)

(2) Final installation torque for the ground terminal nut … 30.5 ± 3.5 N·m (22 ± 3 lb ft)

(3) Final installation torque for the ground terminal nut … 2.25 ± 0.25 N·m (20 ± 2 lb in)

Note: The switch terminal must be insulated with heat shrink tubing. Do not use molded terminals.

(4) Final installation torque for the switch terminal nut … 2.25 ± 0.25 N·m (20 ± 2 lb in)

Note: The internal Torx screw must be held during tightening or loosening of the motor terminal nut (5) .

(5) Final installation torque for the motor terminal nut … 14.7 ± 3.4 N·m (11 ± 3 lb ft)

(6) Final installation torque for the motor frame terminal nut … 8 ± 3 N·m (70 ± 27 lb in)

Solenoid assembly

Current draw at 20 V and 25 °C (77 °F)

Pull-in windings … 57 Amp
Hold-in windings … 13 Amp
Maximum rated current … 750 Amp

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