SkyTrak 6036 Service Manual - Manual (Page 255)

Section 10. Electrical System
Model 6036 S/N 9B0499 and Before 10-61
10.13 EMERGENCY BRAKING
AND STEERING SYSTEM
10.13.1 Low Oil Pressure Switch
The emergency pump oil pressure switch (31, Fig.
10.5) performs three functions:
• When starting the engine, the switch
energizes the emergency steer pump to
supply oil pressure as the engine is being
started;
• When oil pressure at the engine rises
above 4 psi (0,3 bar), the switch opens,
stopping the emergency steer pump
because the engine is turning fast enough
for the tandem pump to supply sufficient
hydraulic oil pressure for forklift operation.
• If engine oil pressure again falls below 4
psi (0,3 bar), the switch will close and the
emergency steer pump will resume
operation for as long as the battery retains
a sufficient charge.
6. Coupling
7. Washer
8. Screw
9. Washer
10. Ground Strap
1. Motor
2. Pump
3. Screw
4. Solenoid
5. Terminal Cable
Fig. 10.68 Steering and Emergency Brake Pump and
Motor (S/N 7P0013 and Before)
a. Removal
1. Disconnect negative (–) cable (2, Fig. 10.38)
from the batteries.
2. Unlock and open right engine access door.
3. Tag and disconnect wires from terminals of
emergency pump oil pressure switch.
4. Remove the switch.
b. Disassembly
Do not disassemble the engine emergency pump
oil pressure switch.
c. Cleaning and Drying
Without submerging the switch, clean the switch
as required by using a fiber bristle brush and an
approved solvent.
d. Inspection and Replacement
1. Test the switch for continuity. It should close
when oil pressure falls below 4 psi (0,3 bar). It
should open when oil pressure rises above 4
psi (0,3 bar).
2. Replace the switch if it fails to pass the tests in
step 1.
e. Installation
1. Install the emergency pump oil pressure
switch.
2. Connect the wires to the terminals of the
emergency pump oil pressure switch.
engine, allow engine to idle for several min-
utes, and check for leakage at the heater
connections.
6. Disconnect battery ground cable (2, Fig.
10.38) from the negative terminals of the
batteries.
7. Connect wiring to motor.
8. Prepare to electrically ground the heater unit
by positioning tooth type ground washers (3,
Fig 10.67) over the tapped holes in the coolant
inlet/outlet side of the heater. Use a thin,
transparent tape to temporarily secure the
washers to the heater unit.
9. Slide heater and fan unit (7) into position
under suspension support (12) without disturb-
ing the ground washers (3) which were taped
into position during the previous step.
10. Install two lock washers (5), capscrews (4)
and spacers (6) at the other side of the
suspension support (12).
11. Install two lock washers (2) and capscrews (1)
through the holes in the suspension support
(12) and through the tooth type grounding
washers (3) into the tapped holes in the
heater.
12. Connect negative (–) cable (2, Fig. 10.38) to
the batteries.
13. Test heater fan motor operation.
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