POWER TRAIN MLC165-1 SERVICE/MAINTENANCE MANUAL
7-8
Published 05-26-17, Control # 238-02
ENGINE THROTTLE ADJUSTMENT
The engine throttle assembly consists of an electronic hand
throttle control in the left console and an electronic foot
throttle control on the cab floor. There is no mechanical
linkage between the throttle controls.
Electronic signals from the throttle controls are transmitted to
the crane’s programmable controller, and the programmable
controller increases and decreases engine speed
accordingly.
Hand Throttle Control
The hand throttle control does not require adjustment and is
not repairable.
Foot Throttle Control
See Figure 7-6, page 7-9.
If there is a problem with the foot throttle, it is best to either
replace it or send the unit to the Manitowoc Crane Care
Lattice Team for repair.
However, if field disassembly was done, use the following
procedure to re-assemble and calibrate the throttle control.
NOTE The foot throttle control was properly assembled
and calibrated at the initial installation and should
not require further attention.
Foot Throttle Control Assembly and Calibration
Steps 1 through 7 must be done on a clean work bench.
1. To assemble the right-side shaft (3) and the torsion
spring (5) into the housing (1), first assemble the spring
onto the shaft by inserting the lug on one end of the
spring into the hole in the head of the shaft.
2. Insert the shaft into the cavity in the bottom of the
housing, through the bearing (8), and into the pedal (2).
Insert the lug on the other end of the spring (5) in the
hole in the housing (Section A-A).
3. Insert the left-side shaft (4) into the cavity in the bottom
of the housing, through the bearing (8), and into the
pedal.
4. Rotate the pedal as needed and install the roll pins (10)
through the holes in the pedal and the shafts (Pedal
Position A).
5. Install the setscrew (14). Do not insert it deep enough to
contact the head on the right-side shaft.
6. Rotate the pedal approximately 40° to position B (low
idle). At this time, the flat on the head of the right-side
shaft should be parallel with the surface X on the
housing. Finish turning-in the set screw (14) until it
contacts the flat on the head of the shaft (Section A-A).
7. Install the potentiometer (6) and calibrate the foot
throttle:
a. Re-solder the control wires (11a, 11b, 11c) to the
potentiometer and resistor leads.
b. With a supply voltage of 25.0 to 26.0 VDC, turn the
potentiometer (6) shaft fully CCW as viewed from
the shaft end (zero volts out).
c. With the pedal in Position B, insert the
potentiometer into the cavity in the bottom of the
housing as shown in View B-B. Insert the
potentiometer shaft into the end of the left-side shaft
(4) and tighten the set screw (15).
d. Rotate the pedal to the high idle position, hold in
place using the set screw (14), and rotate the
potentiometer housing to obtain an output of 0.90 to
1.00 VDC.
e. Apply silicone sealant RTV-162 between the
housing and potentiometer. Do not get sealant on
the shaft. Allow sealant to cure before proceeding to
the next step.
f. After sealant has cured, check output for 0.90 to
1.00 VDC in high idle position.
g.
Remove the set screw (14) and apply Loctite #243
to the threads. Install and adjust the set screw to
obtain a low idle position output reading of 2.90 to
3.00 VDC.
8. Install the assembly onto the crane.
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