DRESSTA TD-25M EXTRA, Руководство по обслуживанию

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ELECTRICAL
SECTION 8
Page 53
DRESSTA TD-25M EXTRA
CRANKING MOTOR 39 MT
The 39MT HD cranking motor has metric threads and nuts for all connections Fig. 8.21.
The tightening torques for the electrical connections on the cranking motor terminal are typically as
follows (See Table 3).
Table 3
Terminal Size Torque [Nm]
Ground Terminal M12 x 1.75 24.0 ÷ 28.0
Solenoid Battery Terminal – B+ M12 x 1.75 24.0 ÷ 28.0
Solenoid Switch Terminal – “S” M5 x 0.8 2.0 ÷ 2.5
Switch Terminal – “M” M6 x 1.0 2.4 ÷ 3.0
Fig. 8.21. Connection of 39MT HD Cranking Motor
1. Switch Terminal - “M”
2. Solenoid Battery Terminal - B+
3. Solenoid Switch Terminal - “S”
4. Ground
Terminal
The 39MT HD cranking motor is more efficient than the earlier 42MT model, providing more output
torque for stronger starts with a new planetary gear reduction design. This reduction also reduces
heat build-up in the cranking motor. The open construction of the new 39MT HD allows for the
release of any condensation that has formed or contamination that has penetrated the device,
increasing the reliability of the motor. The smaller size of the 39MT HD provides better clearance,
visibility, and access.
The Delco Remy electrical "Soft Start" system slowly rotates the pinion until it is properly engaged
to the ring gear before cranking. This feature provides an additional measure of protection from the
inputs that can cause pinion chipping and milling which can result in cranking motor failure.