Illustration 1 g00697657
Side view of the 50-MT series
(1) Nut (battery terminal)
(2) Screw (terminal assembly)
(3) Bolts (solenoid mounting)
(4) Pinion
(5) Bolts (rear frame)
(6) Screw (field winding) (brush lead)
(7) Commutator
(8) Brushes
(9) Laminated core
(10) Screws (field winding)
(11) Bolts (shift lever housing)
(12) Screw (pinion drive housing)
Illustration 2 g00697684
Front view of the solenoid for a 50 MT series
(1) Nut (battery terminal)
(2) Screw (terminal assembly)
(13) Nuts (terminal)
| 50-MT Complete Starting Motor Specifications | |||
|---|---|---|---|
| Rated Voltage | 24V | 32V | 64V |
| Solenoid Winding | |||
| Pull-In Resistance | .43 to .56 Ω | 1.2 to1.43 Ω | 3.56 to 3.97 Ω |
| Hold-In Resistance | 2.9 min Ω | 5.3 to 7.0 Ω | 17.1 to 18.9 Ω |
| Pull-In Current | 9.0 to 11.5 Amp at 5 V | 7.0 to 8.3 Amp at 10 V | 7.0 to 8.3 Amp at 10 V |
| Hold-In Current | 6.8 Amp max at 20 V | 4.0 to 5.3 Amp at 28 V | 4.0 to 5.3 Amp at 28 V |
| No Load Test | |||
| Voltage | 20V | 30V | 32V |
| Current (max) | 120 Amp | 125 Amp | 90 Amp |
| Speed (min) | 5500 rpm | 7500 rpm | 5500 rpm |
| Load Test | |||
| Voltage | 18V | 24V | NA |
| Current (max) | 750 Amp | 700 Amp | NA |
| Speed (min) | 1200 rpm | 1100 rpm | NA |
| Commutator (7) | |||
| Diameter | 58.7 to 58.9 mm (2.34 to 2.32 inch) | 58.7 to 58.9 mm (2.34 to 2.32 inch) | 58.7 to 58.9 mm (2.34 to 2.32 inch) |
| Diameter (min) | 56.7 mm (2.23 inch) | 56.7 mm (2.23 inch) | 56.7 mm (2.23 inch) |
| Depth Of Insulation Between Commutator Bars (min) | 0.64 mm (.025 inch) | 0.64 mm (.025 inch) | 0.64 mm (.025 inch) |
| Brush (8) | |||
| Length | 19.1 to 19.8 mm (.75 to .78 inch) | 19.1 to 19.8 mm (.75 to .78 inch) | 19.1 to 19.8 mm (.75 to .78 inch) |
| Length (min) | 10 mm (.4 inch) | 10 mm (.4 inch) | 10 mm (.4 inch) |
| Pinion Clearance (4) | 9.1 ± 0.8 mm (0.36 ± 0.03 inch) | 9.1 ± 0.8 mm (0.36 ± 0.03 inch) | 9.1 ± 0.8 mm (0.36 ± 0.03 inch) |
| Maximum Total Indicator Runout (TIR) | |||
| Commutator (7) | 0.13 mm (.005 inch) | 0.13 mm (.005 inch) | 0.13 mm (.005 inch) |
| Laminated Core (9) | 0.13 mm (.005 inch) | 0.13 mm (.005 inch) | 0.13 mm (.005 inch) |
| Torques | |||
| Terminal Nuts (1) | 30.5 ± 3 N·m (22.5 ± 2.2 lb ft) | 30.5 ± 3 N·m (22.5 ± 2.2 lb ft) | 30.5 ± 3 N·m (22.5 ± 2.2 lb ft) |
| Terminal Nuts (13) | 2.25 ± .25 N·m (20 ± 2 lb in) | 2.25 ± .25 N·m (20 ± 2 lb in) | 2.25 ± .25 N·m (20 ± 2 lb in) |
| Terminal Screw (2) | 2.25 ± .25 N·m (20 ± 2 lb in) | 2.25 ± .25 N·m (20 ± 2 lb in) | 2.25 ± .25 N·m (20 ± 2 lb in) |
| Solenoid Mounting Bolts (3) | 12.2 ± 2.7 N·m (108 ± 24 lb in) | 12.2 ± 2.7 N·m (108 ± 24 lb in) | 12.2 ± 2.7 N·m (108 ± 24 lb in) |
| Rear Frame Bolts (5) | 12.2 ± 2.7 N·m (108 ± 24 lb in) | 12.2 ± 2.7 N·m (108 ± 24 lb in) | 12.2 ± 2.7 N·m (108 ± 24 lb in) |
| Shift Lever Housing Bolts (11) | 12.2 ± 2.7 N·m (108 ± 24 lb in) | 12.2 ± 2.7 N·m (108 ± 24 lb in) | 12.2 ± 2.7 N·m (108 ± 24 lb in) |
| Pinion Drive Housing Screw (12) | 20 ± 3 N·m (177 ± 27 lb in) | 20 ± 3 N·m (177 ± 27 lb in) | 20 ± 3 N·m (177 ± 27 lb in) |
| Field Winding And Brush Lead Screw (6) | 2.9 ± 1.0 N·m (26 ± 9 lb in) | 2.9 ± 1.0 N·m (26 ± 9 lb in) | 2.9 ± 1.0 N·m (26 ± 9 lb in) |
| Field Winding Screws (10) | 20.3 ± 2.3 N·m (180 ± 20 lb in) | 20.3 ± 2.3 N·m (180 ± 20 lb in) | 20.3 ± 2.3 N·m (180 ± 20 lb in) |
| Starting Motor Weight | 35.4 kg (78 lb) | 35.4 kg (78 lb) | 35.4 kg (78 lb) |