DRESSTA TD-25M EXTRA, Service Manual

Page: 328 / 595

SECTION 8
ELECTRICAL
Page 52
TD-25M EXTRA DRESSTA
CRANKING MOTOR 39 MT
NOTE:
New Delco Remy 39MT HD cranking motor for applications up to 16 liters replaces the old
42MT cranking motor.
25. SPECIFICATIONS
Manufacturer type ........................................................................................... Delco Remy 39 MT HD
Maximum power ..................................................................................................................... 9.7 [HP]
Supply voltage ............................................................................................................................24 [V]
Pinion tooth ...................................................................................................................................... 12
Noise housing bolts torque (SAE3 – 3 Bolt 120 degree) .................................................. 43÷53 [Nm]
The technical and design features of the 39MT HD cranking motor as compared to the 42MT
cranking motor are:
-
Soft start engagement,
-
Solid link solenoid,
-
High solenoid barrier,
-
Wet seal for both dry and wet flywheel housings,
-
Enhanced reliability and durability.
NOTE: The soft start engagement feature of the 39MT-HD increases the in-rush and steady-state
current draw requirements compared to the 42MT. Due to the location of switches and safety
equipment of some applications, the control side wiring is critical for the 39MT-HD. The Integral
Magnetic Switch (IMS, see Fig. 8.23) option, when used with the current magnetic switch reduces
the control side current draw for these type of applications. The IMS option provides the
opportunity to use a shorter wiring run and reduces the number of attachment points. This should
result in a higher quality installation.
The 39MT HD cranking motor has the similar power as the 42MT, with the same battery
configuration, but is a smaller, lighter package size as summarized in Table 1 below:
Table 1
Cranking
motor
Weight
[kg]
Frame OD
[mm]
Mounting Length- flange
to motor body [mm]
Mounting Length- flange
to ground stud [mm]
39MT HD ~14 114 303 361
42 MT ~26 130 358 393
In general, the electrical requirements for the 39MT HD cranking motor are the same as to
the 42MT except for the cranking motor solenoid relay current.
The design features and electrical requirements are summarized in Table 2 below.
Table 2
Profile 42 MT 39MT HD
Cranking motor Solenoid Relay Current N.A. / 75 [A] 200 / 50* [A]
Cranking Circuit Resistance Max. 0.002 [Ohm] Max. 0.002 [Ohm]
Control Circuit Voltage Drop at 20 [°C] Max. 2 [V] Max. 2 [V]
Engagement Positive Soft Start
Ventilation Orientation Not Applicable +/- 30 [°]
Solenoid barrier Normal or High High
Seal Wet or Dry Wet
* - in-rush / steady-state current