Daewoo Solar 420LC-V, Manual

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Page 29
Hydraulic System Troubleshooting, Testing and
Adjustment
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TROUBLESHOOTING - JOYSTICK CONTROL VALVE
Problem Possible Causes Remedies
Secondary pressure does not
increase Low primary pressure Check primary pressure
Broken spring Replace spring
Spool sticking Clean, repair or replace
Excess spool to casing
clearance Replace spool casing
Worn or loose handle
subassembly Repair or replace handle
subassembly
Secondary pressure too high Dirt, other interference between
valve parts Clean, repair or replace
Return line pressure too high Redirect return line
Secondary pressure does not
hold steady Dirt, other interference between
valve parts, or worn spool
sticking intermittently Clean, repair or replace
Interference or binding on spool
return spring Clean, repair or replace
Unsteady pressure in tank
return line Redirect return line
Air bubbles in piping (temporary)
or air leak Vent air, or repair leak
NOTE:
Look for evidence of leaking oil to help locate damaged seals or gaskets that could be
the cause of air leaks.