Vanair Reliant RS45 Installation, Operation, Maintenance And Parts Manual page 50

SECTION 6: TROUBLESHOOTING
6.3 TROUBLESHOOTING GUIDE - HYDRAULICS
MALFUNCTION/FAULT
HYDRAULIC DRIVE SYSTEM: INCORRECT PRESSURE CONDITION (CONTINUED)
Pressure is low
(continued)
Pressure is erratic
Pressure is excessive
Hydraulic Flow Does Not
Move
Hydraulic Flow Moves
Slowly
PAGE - 42
POSSIBLE CAUSE
Pump, motor or cylinder is
damaged or inoperable
Air is present in fluid
Relief valve is worn or inoperable
Fluid is contaminated
Accumulator is defective or has lost
charge
Pump, motor or cylinder is worn
Pressure reducing, relief, or
unloading valve out of adjustment
Yoke actuating device is
inoperative (variable displacement
pumps)
Pressure reducing, relief, or
unloading valve is worn or
damaged
HYDRAULIC DRIVE SYSTEM: FAULTY OPERATION
No flow or pressure
Limitation component is
(mechanical, electrical or hydraulic)
is inoperative or out of adjustment
Mechanically bound
Command signal to servo amplifier
is absent
Servo amplifier is inoperative or out
of adjustment
Servo valve is inoperative or out of
adjustment
Cylinder or motor is worn or
damaged
Low system flow
090126-OP_r0 (JAN-2018)
RELIANT RS45 AIR COMPRESSOR
CORRECTIVE ACTION
Overhaul or replace as necessary.
Tighten leaking connections, fill reservoir
to proper level, and bleed air from
system.
Rebuild or replace valve.
Check system fluid and filters; replace if
necessary.
Overhaul or replace as necessary.
Overhaul or replace as necessary.
Adjust; Rebuild or replace if necessary.
Overhaul or replace yoke actuating
device.
Overhaul or replace as necessary.
Refer to information under INCORRECT
FLOW CONDITION in this guide.
Overhaul or replace.
Locate the bind, and repair.
Repair command console or connection
wire(s).
Adjust, repair or replace.
Adjust, repair or replace.
Overhaul or replace cylinder or motor.
Refer to information under INCORRECT
FLOW CONDITION in this guide.
Continued on next page
VANAIR MANUFACTURING, INC.
(844) VAN-SERV • www.vanair.com