POWER TRAIN 16000 SERVICE/MAINTENANCE MANUAL
7-6
Published 05-03-17, Control # 228-03
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, which increases and
decreases the engine speed accordingly.
Hand Throttle Control
The hand throttle control does not require adjustment and is
not repairable.
Foot Throttle Control
See Figure 7-4 for the following procedure.
If there is a problem with the foot throttle, replace it or send
the unit to the Manitowoc Crane Care Lattice Team for repair.
If the foot throttle is disassembled, use the following
procedure to re-assemble and calibrate the throttle control.
Foot Throttle Control Assembly and Calibration
Complete the following procedure on a clean work bench:
1. To assemble the right-side shaft (3) and torsion spring
(5) into the housing (1), secure 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 (3) into the cavity in the bottom of the
housing (1), through the bearing (9), and into the pedal
(2). The lug on the outboard end of the spring (5) must
engage the hole in the housing (1) (section view A-A).
3. Insert the left-side shaft (4)
into the cavity in the bottom of
the housing (1), through the bearing (9), and into the pedal
(2).
4. Rotate the pedal (2) and install the roll pins (11) through
the holes in the pedal and shafts (Pedal Position A).
5. Install the set screw (16). Do not insert the set screw
deep enough to contact the head on the right-side shaft
(3).
6. Rotate the pedal approximately 40° to position B (low
idle). The flat on the head of the right-side shaft (3)
should be parallel with surface X on housing. Tighten the
set screw (16) until it contacts the flat on the head of the
shaft (section view A-A).
7. Install the potentiometer (7) 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 the
potentiometer (7) shaft fully counter-clockwise as
viewed from the shaft end (zero volts out).
c. With the pedal (3) in Position B, insert the
potentiometer (7) into the cavity in the bottom of the
housing (1) as shown in View B-B. Insert the
potentiometer shaft into the end of the shaft (4) and
tighten the set screw (17).
d. Rotate the pedal to the high idle position and secure
it using the set screw (16).
e. Rotate the potentiometer housing to obtain an
output of 0.90 to 1.00 VDC.
f. Apply silicone sealant RTV-162 between the
housing (1) and potentiometer (7). Do not get
sealant on the shaft (4). Allow the sealant to cure
one to two hours before proceeding.
g. After the sealant has cured, check the output for
0.90 to 1.00 VDC in the high idle position.
h. Remove the set screw (16), apply Loctite 243 to the
threads, and adjust the set screw to obtain a low idle
position output reading of 2.90 to 3.00 VDC.
8. Install the assembly on the crane.
Component Identification for Figure 7-4
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
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
To Next Page
Loading...
Need help?
General
