Yard Machines 550 - Section 15: Hydraulic Trouble Shooting Guide

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SECTION 15: HYDRAULIC TROUBLE SHOOTING GUIDE
Trouble Possible Causes Corrective Action
Cylinder rod will
not move
Broken drive shaft.
Shipping plugs left in
hydraulic hoses.
Set screws in coupling not
adjusted properly.
Loose shaft coupling.
Gear sections damaged.
Damaged relief valve.
Hydraulic lines blocked.
Incorrect oil level.
Damaged directional valve.
Blocked directional valve.
Return unit for authorized repair.
Disconnect hydraulic hoses, remove shipping plugs, reconnect hoses.
See operator’s manual for correct adjustment.
Correct engine/pump alignment as necessary. See operator’s manual.
Return unit for authorized repair.
Return unit for authorized repair.
Flush and clean hydraulic system.
Check oil level.
Return unit for authorized repair.
Flush and clean hydraulic system; return unit for authorized repair.
Slow cylinder
shaft speed while
extending and
retracting
Gear sections damaged.
Excessive pump inlet
vacuum.
Slow engine speed.
Damaged relief valve.
Incorrect oil level.
Contaminated oil.
Directional valve leaking
internally.
Internally damaged cylinder.
Return unit for authorized repair.
Make certain pump inlet hoses are clear and unblocked-use short, large
diameter inlet hoses.
Return unit for authorized repair.
Return unit for authorized repair.
Check oil level.
Drain oil, clean reservoir, refill, make certain oil return tube is below oil
level.
Return unit for authorized repair.
Return unit for authorized repair.
Engine runs but
wood will not
split, or wood
splits too slowly
Small gear section
damaged.
Pump check valve leaking.
Excessive pump inlet
vacuum.
Incorrect oil level.
Contaminated oil.
Directional valve leaking
internally.
Overloaded cylinder.
Internally damaged cylinder.
Return unit for authorized repair.
Return unit for authorized repair.
Make certain pump inlet hoses are clear and unblocked; use short, large
diameter inlet hoses.
Check oil level.
Drain oil, clean reservoir, refill, make certain oil return tube is below oil
level.
Return unit for authorized repair.
Do not attempt to split wood against the grain.
Return unit for authorized repair.
Engine stalls
during
splitting
Low horsepower/weak
engine.
Overloaded cylinder.
Return unit for authorized repair.
Do not attempt to split wood against the grain. If engine stalls repeatedly,
take unit for authorized repair.
Engine will not
turn or stalls
under low load
conditions
Engine/pump misalignment.
Frozen or seized pump.
Low horsepower/weak
engine.
Hydraulic lines blocked.
Blocked directional valve.
Correct alignment as necessary. See operator’s manual.
Return unit for authorized repair.
Return unit for authorized repair.
Flush and clean hydraulic system.
Flush and clean hydraulic system; return unit for authorized repair.
Leaking pump
shaft seal
Broken drive shaft.
Engine/pump misalignment.
Gear sections damaged.
Poorly positioned shaft seal.
Plugged oil breather.
Return unit for authorized repair.
Correct alignment as necessary. See operator’s manual.
Return unit for authorized repair.
Return unit for authorized repair.
Make certain reservoir is properly vented.