Advance acoustic 56514925, Service Manual

Page: 144 / 260

Hydraulic System 144 Service Manual – Advance 7765 / Nilfisk CR1500
Checking Nominal Pressure Readings
Note: There are two
#8 Flat Face O-ring Fittings
on the
Auxiliary Pump
that can be used to
check the pressure from both sides of the
Auxiliary Pump
. Checking the hydraulic
pressures at other locations will require
you to assemble the appropriate fittings
that will allow you to connect your
pressure gauge at that location.
1. Install the appropriate fittings between the hydraulic
hose and the cylinder or motor that will allow you to
connect the pressure gauge.
2. Run the engine in the high throttle position and allow
the hydraulic oil to warm up.
• The bypass pressure is the pressure reading with
no motor or cylinder operating.
• The operational pressure is the pressure range in which the motor or cylinders will operate.
• A much lower than normal bypass pressure could indicate a gear pump problem.
• If the bypass pressure remains the same after turning the function on, there could be a problem in
the control valve or circuit.
• If the operational pressure is within range but the motor speed is too slow, the problem could be in
the motor.
• Check individual system
Troubleshooting
sections in this manual for additional information.
#8 Flat Face
O-ring Fitting
Auxiliary
Pump