SERVICE REPAIR
R30XM R30XMA R30XMF [F118]
1600 SRM 691
Description
General
This section contains procedures for adjustment, re-
pair, and troubleshooting of the Electric Power Steer-
ing (EPS III) System and Advanced Power Steering
(APS) System. The systems control the steer motor
used to turn the master drive unit. The lift truck
steering is controlled by turning the master drive
unit.
EPS III
EPS III is only applicable to the B174, E118, F118,
and C174 trucks. There are three types of EPS
III systems available: the standard system, called
the Return-to-Center (RTC) Steering System, the
optional Tach Generator Steering (TGS) System,
and the optional Wire Guidance Steering System.
This section pertains to the RTC and TGS Systems
only.
NOTE: This manual is NOT applicable to lift trucks
with the optional Wire Guidance Steering System.
See the section Wire Guidance - Description 2200
SRM 421 for checks and adjustments and the section
Wire Guidance - Repair 2200 SRM 422 for repairs
to the steering system of trucks equipped with the
Wire Guidance Steering System.
APS
APS is only applicable to the G118 and D174 trucks.
There are two steering input devices used with
the APS: the standard system, called the Mul-
titurn Steering (MTS) System and the optional
Return-to-Center (RTC) System.
Description
EPS III
The EPS System is comprised of the following com-
ponents:
• Steering handle (RTC System) or steering wheel
(TGS System)
• Command potentiometer (RTC System) or the tach
generator (TGS System)
• Feedback potentiometer
• Steer system wire harness
• Electronic Control Module (ECM)
• Lift truck battery
• Steer motor
• Steering sprocket and chain
WARNING
The Master Drive Unit (MDU) will automati-
cally center when the key is ON. Keep hands,
arms, and other appendages and tools clear.
The RTC System has a steering handle that returns
to the center position when released. The handle
moves 100 degrees each side of center for the full
range of steer