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Figure 3-4. Back Section Circuit
3-6. BACK SECTION DIAGNOSIS CHART
Problem Reason
Back Section 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
Back Section function chatters or loses position Defective or Dirty Check Valves
Oil Leakage in Circuit
Air Inside Cylinder
Pinched Hose
Low on Oil
PLUMBING
TERMINAL
UP CIRCUIT
DOWN CIRCUIT
NOTE: ONE SIDE
SHOWN FOR CLARITY
BACK SECTION
CYLINDER ASSEMBLY
COPPER
LINES
CHECK
VALVE
SPEED
CONTROL
MINI-VALVE
INTERNAL OIL
FROM PUMP
INTERNAL OIL RETURN
TO RESERVOIR