Manitowoc Published 09-05-14, Control # 226-02 7-17
14000 SERVICE MANUAL POWER TRAIN
ENGINE THROTTLE
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 7-11 for following procedure.
NOTE The foot throttle control was properly assembled
and calibrated at the initial installation and should
not require further attention.
NOTE: 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.
Foot Throttle Control Assembly and Calibration
The following must be done on a clean work bench.
1. To assemble right-side shaft (3) and torsion spring (5)
into housing (1), first assemble spring onto shaft by
inserting lug on one end of spring into hole in head of
shaft.
2. Insert shaft (3) into cavity in bottom of housing (1),
through bearing (9), and into pedal (2).
Lug on outboard end of spring (5) must engage hole in
housing (1) (Section A-A).
3. Insert left-side shaft (4)
into cavity in bottom of housing (1),
through bearing (9), and into pedal (2).
4. Rotate pedal (2) as needed and install roll pins (11)
through holes in pedal and shafts (Pedal Position A).
5. Install setscrew (16). Do not insert deep enough to
contact head on shaft (3).
6. Rotate pedal approximately 40° to position B (low idle).
At this time flat on head of shaft (3) should be parallel
with surface X on housing. Finish turning in set screw
(16) until it contacts flat on head of shaft (Section A-A).
7. Install potentiometer (6) and calibrate the foot throttle:
a. Re-solder the control wires to the potentiometer and
resistor leads.
b. With a supply voltage of 25.0 to 26.0 VDC, turn
potentiometer (7) shaft fully CCW as viewed from
shaft end (zero volts out).
c. With pedal (3) in Position B, insert potentiometer (7)
into cavity in bottom of housing (1) as shown in View
B-B. Insert potentiometer shaft into end of shaft (4)
and tighten setscrew (17).
d. Rotate pedal to high idle position, hold in place
using setscrew (16), and rotate potentiometer
housing to obtain an output of 0.90 to 1.00 VDC.
e. Apply silicone sealant RTV-162 between housing
(1) and potentiometer (7). Do not get sealant on
shaft (4). Allow sealant to cure one to two hours
before proceeding to next step.
f. After sealant has cured, check output for 0.90 to
1.00 VDC in high idle position.
g. Remove setscrew (16), apply Loctite 242 to threads,
and adjust setscrew to obtain a low idle position
output reading of 2.90 to 3.00 VDC.
8. Install assembly onto crane.
Component Identification for Figure 7-11
Item Qty. Description Item
Qty.
Description
1 1 Foot Pedal Housing 10 1 Conduit Nut
2 1 Foot Pedal 11 2 Roll Pin
3 1 Foot Pedal Shaft (right) 12 1 Receptacle
4 1 Foot Pedal Shaft (left) 13 1 Resistor, 220 ohm
5 1 Torsion Spring 14 2 Cap Screw
6 1 Receptacle Mounting Bracket 15 2 Flat Head Screw
7 1 Potentiometer 16 1 Set Screw
8 1 Zener Diode 17 1 Set Screw
9 2 Roller Bearing 18 2 Lock Washer
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