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3-8. LEG SECTION DIAGNOSIS CHART
Figure 3-6. Leg Section Circuit
Problem Reason
Leg function moves improperly Incorrect Speed Adjustment
Spool Valve Not Centered or Adjusted Properly
Bad Check Valves
Low on Oil
Pinched Hose
Defective Mini-Valve
Pressure Relief Valve Not Set Properly
Defective Solenoid or Wiring
Defective Relay Box or Pendant Control
Leg function chatters or loses position Defective or Dirty Check Valves
Oil Leakage in Circuit
Air In Slide Cylinder
Pinched Hose
Low on Oil
PLUMBING
TERMINAL
COPPER
LINES
UP CIRCUIT
DOWN CIRCUIT
LEG SECTION
CYLINDER ASSEMBLY
NOTE: ONE SIDE
SHOWN FOR CLARITY
CHECK
VALVE
SPEED
CONTROL
MINI-VALVE
INTERNAL OIL
FROM PUMP
INTERNAL OIL RETURN
TO RESERVOIR