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POWER TRAIN 2250 SERVICE/MAINTENANCE MANUAL

7-22

Published 11-06-15, Control # 040-13

12. Verify calibration at minimum and maximum throttle

positions while monitoring ENGINE SPEED on digital

display in operator’s cab.

Minimum speed should be 975±25 rpm. Maximum

speed should be 2100±10 rpm.

Adjust threshold and span potentiometers as needed so

that engine speed is within ranges specified.

13. Reinstall cover plate and hand throttle controller on

console.

Cummins N14 – C525e 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).

Engine Speed Calibration

To calibrate the voltage output of the hand and foot throttle

controllers to the engine ECM, proceed as follows:

NOTE: Calibration is required only when either controller

or the ECM is replaced.

1. Stop engine (engine must be off).

2. Turn on cab power switch.

3. Move engine run/stop switch to run position.

4. Operate hand throttle (or foot throttle) from low idle

position to high idle position three times in succession.

5. Move engine run/stop switch to stop position.

6. Calibration is complete.

NOTE: It is normal for amber engine warning light to

flashing fault codes when step 4 is performed. See

Engine Diagnostic instructions in Section 10 of this

manual.

Cummins QSC8.3, QSM11, or QSX15 Engine