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SECONDARY
PISTON
O-RING
FLEXIBLE
HOSE
INTERNAL OIL RETURN
TO RESERVOIR
PRIMARY
PISTON
O-RING
INTERNAL OIL
FROM PUMP
MINI-VALVE
SPEED
CONTROL
CHECK
VALVE
COPPER
LINE
PLUMBING
TERMINAL
3-3. ELEVATION DIAGNOSIS CHART
Figure 3-1. Elevation Circuit
Problem Reason
Table will not elevate properly Pressure Relief Valve Not Set Properly
Low on Oil
Spool Valve Not Centered or Adjusted Properly
Defective Pump
Defective Mini-Valve
Defective Solenoid or Wiring
Defective Relay Box or Pendant Control
Table will not descend properly Incorrect Speed Adjustment
Bad Check Valve
Spool Valve Not Centered
Defective Solenoid or Pendant Control
Table loses elevation Bad Check Valve
Leaking Mini-Valve
Loose Fittings, Joints, Hoses
Leaking "O" Ring Inside Cylinder
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