Manitowoc Published 11-06-15, Control # 040-13 7-23
2250 SERVICE/MAINTENANCE MANUAL POWER TRAIN
8. With foot pedal in low idle position, distance from top of
pedal to cab floor should be 3-15/16 in (100 mm).
Caterpillar 3406C Engine
General
The throttle assembly consists of an electronic control
module (ECM) on the engine, a hand throttle controller in the
left console, a foot pedal on the cab floor, a foot throttle
controller in the right console, associated linkage, and
electrical connections.
A reach rod in the right console connects the foot pedal to
the lever on the foot throttle controller. An electric cable
connects the hand throttle controller in the left control
console to the foot throttle controller.
Foot Throttle Linkage Adjustment
See Figure 7-24 for the following procedure.
1. Install spring clip (1) and rod end (2) on controller lever
at dimension shown in Figure 7-24
, View A and securely
tighten jam nut (3).
2. Insert a 3/16 in (5 mm) thick shim or piece of floor mat
between foot pedal and cab floor.
3. Press foot pedal down fully to high idle position against
shim or floor mat.
4. Adjust reach rod (4) and rod end (5) so controller lever is
rotated fully to high idle position. Securely tighten jam
nuts (6) to lock adjustment.
NOTE: Controller has internal stops at high and low idle.
5. Release foot pedal to low idle position.
6. Adjust return springs so there is sufficient force to raise
pedal and rotate controller lever to low idle.
7. Adjust pedal stop screw (7). Screw must be tight against
cab floor and there must be 1/8 in (31 mm) gap between
pin (9) and rear end of slot in rod end (5). Securely
tighten jam nut (8).
8. With foot pedal in low idle position, distance from top of
pedal to cab floor should be 3-15/16 in (100 mm).
Electronic Fuel Control Adjustment
See Figure 7-27 for the following procedure.
The electronic fuel control was adjusted at the factory and
should not need further attention. Adjustment is required if
the control is replaced. Adjustments are to be completed in
the sequence given in this section.
The electronic fuel control is located in the junction box
mounted on the right side of the engine. Figure 7-27
shows
the locations of the potentiometers and other controls inside
the junction box.
Engine speeds given in this section are nominal, and can
vary plus or minus 50 rpm.
Setting High Speed
1. In cab, make sure clutch is engaged.
2. Start engine.
3. Set throttle to high speed setting.
4. Turn speed pot until ENGINE SPEED on digital display
shows speed is 2,100 rpm.
Low idle is determined by the value of the resistors in the
circuit. Low idle should be approximately 1,000 rpm.
Setting Gain and Stability
1. Set throttle to high speed setting (2,100 rpm).
2. Adjust GAIN as follows:
a. Slowly turn gain adjusting screw clockwise until
engine becomes unstable (engine operation
becomes erratic).
b. Slowly turn gain adjusting screw counterclockwise
until engine becomes stable.
c. Turn gain adjusting screw an additional 1/4 turn
counterclockwise to ensure stable performance.
3. Adjust STABILITY as follows:
a. Slowly turn stability adjusting screw clockwise until
engine becomes unstable (engine operation
becomes erratic).
b. Slowly turn stability adjusting screw
counterclockwise until engine becomes stable.
c. Turn stability adjusting screw an additional 1/4 turn
counterclockwise to ensure stable performance.
4. Test hand and foot throttles to make sure they both
operate within high and low idle settings.
NOTE: Normally, adjustments made at no load achieve
satisfactory performance. However, gain and
stability may require minor adjustments after
engine load is applied.
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