Cub Cadet 59A40003727 サービスマニュアル

•  Air in hydraulic system 

•  Cold hydraulic oil
•  Low hydraulic oil level
•  Poor oil circulation 

 

•  Worn or damaged hydraulic pump
•  Air leak in pump inlet line

•  Cycle cylinders several times to

purge system of air.

•  Run engine to warm oil.
•  Add oil to level specified.
•  Change oil filter and clean

screen in tractor hydraulic 
system.

•  Repair or replace pump.
•  Check, tighten or replace inlet

line.

•  Faulty valve
•  Air in hydraulic system 

 

•  Hydraulic oil too heavy
•  Oil filter plugged
•  Slow engine speed
•  Cylinder piston seals leaking
•  Valve out of adjustment or malfunctioning
•  Tractor hydraulic pump malfunctioning
•  Hydraulic couplers not completely engaged

•  Repair or replace valve.
•  Cycle lift cylinders and bucket

cylinders several times to free 
system from air.

•  Change to proper oil.
•  Clean and replace filter.
•  Increase engine speed rate.
•  Repair (if available) or replace
•  Adjust, repair or replace.
•  Repair or replace pump.
•  Connect hydraulic couplers.

•  Loose hose connections
•  Fittings or hoses defective 

•  Hydraulic cylinder seals worn or damaged 

•  Valve components worn or damaged

•  Tighten fittings.
•  Use thread sealer on pipe

(tapered) threads.

•  Repair seals (if available) or

replace cylinder.

•  Repair and/or replace.

•  Low oil supply
•  Bucket overloaded
•  Hose fittings not fully engaged in couplers
•  Cylinder piston seal leakage
•  Valve out of adjustment or malfunctioning
•  Hydraulic pump malfunctioning
•  Load is greater than boom lift capacity

•  Check oil level.
•  Try lighter load.
•  Recouple hoses.
•  Repair or replace.
•  Repair or replace.
•  Repair or replace.
•  Check loader specifications.