MTD 556 - Manual (Page 16)

HYDRAULIC TROUBLE SHOOTING GUIDE
Problem Probable Cause(s) Corrective Action
Cylinder rod wili not
move A Broken driveshaf
B Loose shaft coup ing
C Gear sections da naged
D Damaged relief v live
E Hydraulic lines bl icked
F Too little oil to pu np
G Damaged directidnal valve
H Blocked direction al valve A Return pump for authorized repair
B Correct engine/pump alignment as necessary
C Return pump
for authorized repair
D Return directional valve for authorized repair
E Flush and clean hydraulic system
F Add oil to reservoir
G Return directional valve for authorized repair
H Flush and clean hydraulic system; return
directional valve for authorized repair
Slow cylinder shaft
speed while
extending and
retracting A Gear sections da maged
B Excessive pump niet vacuum
C Slow engine spei id
D Damaged relief v alve
E Too little oil to pu np
F Air in oil
G Directional valve leaking internally
H Internally damag ad cylinder
A Return pump for authorized repair
B Make certain pump inlet hoses are clear
and unblocked—use short, large
diameter iniet hoses
C Return engine for authorized repair
D Return directional valve for authorized repair
E Add oil to reservoir
F Add oil, clean reservoir, make certain oil
return tube is below oil level
G Return directional valve for authorized repair
H Return cylinder for authorized repair
Engine runs but
wood will not split,
or wood splits too
slowly
A Small gear section damaged
B Pump check vaK e leaking
C Excessive pump inlet vacuum
D Low relief valve : etting
E Too little oil to pump
F Air in oil
G Directional valve leaking internally
H Overloaded cylir der
1 Internally damac ed cylinder
A Return pump for authorized repair
B Return pump for authorized repair
C Make certain pump inlet hoses are
clear and unblocked; use short, large
diameter inlet hoses
D Adjust valve while using pressure gauge*
E Add oil to reservoir
F Add oil, clean reservoir, make certain oil
return tube is below oil level
G Return directional valve for authorized repair
H Do not attempt to split wood against the grain
1 Return cylinder for authorized repair
Engine stalls during
splitting A Low horsepower'weak engine
B Overloaded cylir der A Return engine for authorized repair
B Do not attempt to split wood against the grain
Engine will not turn
or stalls under low
load conditions
A Engine/pump misalignment
B Frozen or seizec pump
C Low horsepower 'weak engine
D Hydraulic lines t ocked
E Blocked directional valve
A Correct alignment as necessary
B Return pump for authorized repair
C Return engine for authorized repair
D Flush and clean hydraulic system
E Flush and clean hydraulic system; return
directional valve for authorized repair
Leaking pump shaft
seal A Broken drivesha t
B Engine/pump mi aalignment
C Gear sections d; imaged
D Poorly positione
i shaft seal
E Plugged oil brea ther
A Return pump for authorized repair
B Correct alignment as necessary
C Return pump for authorized repair
D Return pump for authorized repair
E Make certain reservoir is properly vented
'Should be performed by an authorized service dei iler only.
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