NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M140 Tow Tractor Manual No. 46054
PAGE 1-39
CHAPTER 2 MAINTENANCE
AUGUST 31, 2008
1 SERVICING
Design of the Mechanical Modulator
When the mechanical linkage, cable and modulator are used to connect
engine and transmission, the following design guidelines should be used:
• All levers, pins, and clevises should be case hardened to prevent wear.
• The cable length should be selected to keep bends as gradual as possible.
Bend radius should be 203 mm (8 inches) minimum.
• Select adequate size cable or linkage to transmit load.
solvents.
• The cable housing must be mounted securely at the transmission at the
engine. Support clips may be used to secure the cable and prevent backlash.
Mount completely on the power package and not on the chassis.
• For engines with yield able throttle levers, the modulator should be
connected to the non-yielding position.
pipes, etc.
Normal modulator cables will withstand continuous temperatures of 121°C
(250°F). Insulation, heat shields, or mechanical linkage actuation may be
necessary if continuos temperatures at 121°C (250°F) are exceeded. Special
cables are also available for applications that operate at high temperatures.
All transmission control linkages must be reviewed by Allison Engineering.
When adjusting the mechanical actuator, the procedure noted below should
be followed:
make sure lever is in the non-yielded position.
• Pull (or push) modulator cable until it is internally “bottomed”.
• Adjust clevis or trunnion on end of cable to permit “free pin” with fuel control
lever. With lever still at full throttle position, install and secure pin.
• Check linkage for proper return to idle position. Refer to the modulator
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