Craftsman 247.287751 - Manual (Page 19)

HYDRAULIC TROUBLE SHOOTING GUIDE
Problem Probable Cause(s) Corrective Action
Cylinder rod will not
move
A Broken driveshaft
B Loose shaft coupling
C Gear sections damaged
D Damaged relief valve
E Hydraulic lines blocked
F Too little oil to pump
G Damaged directional valve
H Blocked directional valve
A Return unit for authorized repair
B Correct engine/tpump alignment as necessary
C Return unit for authorized repair
D Return directional valve for authorized repair
E Flush and clean hydraulic system
F Add oil to reservoir
G Return unit for authorized repair
H Flush and clean hydraulic system; return
unit for authorized repair
Slow cylinder shaft
speed while
extending and
retracting A Gear sections damaged
B Excessive pump inlet vacuum
C Slow engine speed
D Damaged relief valve
E Too little oil to pump
F Air in oil
G Directional valve leaking internally
H Internally damaged cylinder
A Return unit for authorized repair
B Make certain pump inlet hoses are clear
and unblocked—use short, large
diameter inlet hoses
C Return unit for authorized repair
D Return unit for authorized repair
E Add oil to reservoir
F Add oil, clean reservoir, make certain oil
return tube is below oil level
G Return unit for authorized repair
H Return unit for authorized repair
Engine runs but
wood will not split,
or wood splits too
slowly
A Small gear section damaged
B Pump check valve leaking
C Excessive pump inlet vacuum
D Low relief valve setting
E Too little oil to pump
F Air in oil
G Directional valve leaking internally
H Overloaded cylinder
1 Internally damaged cylinder
A Return unit for authorized repair
B Return unit 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 reser/oir
F Add oil, clean reservoir, make certain oil
return tube is below oil level
G Return unit for authorized repair
H Do not attempt to split wood against the grain
1 Return unit for authorized repair
Engine stalls during
splitting
A Low horsepower/weak engine
B High relief valve setting
C High unloading valve setting
D Overloaded cylinder
A Return unit for authorized repair
B Adjust valve while using pressure gauge*
C Adjust valve while using pressure gauge*
D 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 seized pump
C Low horsepower/weak engine
D Hydraulic lines blocked
E Blocked directional valve
A Correct alignment as necessary
B Return unit for authorized repair
C Return unit for authorized repair
D Flush and clean hydraulic system
E Flush and clean hydraulic system; return
unit for authorized repair
Leaking pump shaft
seal
A Broken driveshaft
B Engine/pump misalignment
C Gear sections damaged
D Poorly positioned shaft seal
E Plugged oil breather
A Return unit for authorized repair
B Correct alignment as necessary
C Return unit for authorized repair
D Return unit for eiuthorized repair
E Make certain reservoir is properly vented
'Should be performed by an authorized SEARS Service Center only.
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