ELECTROMAGNETIC SHIELD
WARNING
Never operate Power Assist models with the Elec-
tromagnetic Shield removed.
A metallic shield is installed between the MDU and brake
assembly and the steering assembly on power assist steer-
ing units. This shield deflects the electromagnetic field gen-
erated by the MDU and brake assembly which can interfere
with the operation of the torque sensor. Make certain that
the Electromagnetic Shield is reinstalled before operating
the lift truck after servicing to prevent erratic operation of
the power assist steering function.
1. CONTROLLER
2. POSITIVE CONNECTION
3. INSULATED JUMPER WIRES
4. 200-OHM, 2-WATT RESISTOR
5. NEGATIVE CONNECTION
Figure 3. Discharging Capacitors
Calibration
POWER ASSIST STEERING
The following calibration instructions apply to all power
assist steering models.
WARNING
If at any time a tiller handle slowly moves in one
direction during startup, it is likely calibration
needs to be performed.
Power assist steering calibration should be performed if ei-
ther the torque sensor or power assist steering unit is serv-
iced or replaced or anytime the drive tire is replaced.
1.
Position the lift truck on a normal, smooth surface
floor away from personnel or other equipment with the
drive tire centered.
2.
Turn the key switch to the
OFF
position and remove
the drive unit compartment cover.
3.
The Calibration Tab is an unconnected wire with a fe-
male spade connector hanging near the ETACC CAN
connector. Attach the Calibration Tab to the B+ termi-
nal (right post) of the contactor, using a
914 mm (36 in.) 14 Ga. jumper wire with an alligator
clip on one end and a male spade connector on the
other.
NOTE:
If the lift truck is not equipped with coast control,
wedge a deep well socket or 50 mm (2.00 in.) by
20 mm (0.75 in.) wood block into the control arm/swivel
joint area to hold the handle in an operating position.
4.
Position the control arm in the brake
OFF
position and
secure using the coast control. See Figure 4.
5.
Standing clear of the steer handle, turn the key switch
to the
ON
position.
1600 SRM 1637
Calibration
3
