Hydraulic Troubleshooting
PS M6.0 6000
F-code Section C-code
Version no T-code
001 OE35
© BT Products
245
Service Manual 1997-10-23
Hydraulic Troubleshooting
1. Troubleshooting Chart
Troubleshooting hydraulic system will require both the
electrical and hydraulic troubleshooting. For instance,
solenoid valve coils should be suspected. Therefore, this
hydraulic troubleshooting section should be used until if has
been determined that the problem is not electrical.
Electrical troubleshooting is found in the electrical section.
The truck uses two separate hydraulic systems with a
common reservoir and return line filter. One duplex pump and
motor assembly supplies oil under pressure for the power
steering and brake release. A single pump and motor
assembly supplies oil under pressure to the lift/lower control
valve for lifting and lowering the platform.
IF HYDRAULIC PUMP ASSEMBLY DOES NOT OPERATE
PROPERLY, A FEW PRELIMINARY CHECKS SHOULD BE
MADE:
1. Proper oil level
2. All electrical connections tight
3. Battery fully charged
After the preliminary check is accomplished, install a
0-3000
PSI
pressure gauge on the quick coupler in the pressure line
from the pump. NPTF outlet port in the adapter. The
installation of the pressure gauge is required to insure proper
observation of what is occurring in the unit during trouble
shooting. Raise the cylinder to its upper limit stops to develop
maximum pressure of the unit, which will normally be passing
all flow over the relief valve. The pressure gauge should be
reading the set pressure of the relief valve. Remove pressure
on the system by actuating the solenoid operated release
valve.
NOTE!
Proper care and cleanliness should be
observed in servicing to insure the oil does
not become contaminated with dirt or other
foreign material. Contaminants can be drawn
into the pump so as to stick or score pump
which will cause failure of the pump
assembly.
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