Yetter Systems One Seed Jet II Closed Center Hydraulic System - Manual (Page 9)

9
TROUBLESHOOTING
Problem
Hydraulic motor will not run.
Oil leakage at the fan motor.
Oil showing up on hydraulic lines.
Hydraulic motor slow.
Cause
Pressure hose in return outlet.
Hydraulic check valves backwards.
Insufficient tractor hydraulic
pressure.
Incorrect hydraulic connections.
SCV lever stop not installed.
SCV lever stop cut to wrong length.
Tractor SCV linkage is mistimed.
“Flow Checking” at SCV prevents
return oil flow-50 Series tractors.
Control valve failed.
Tractor oil level low.
Faulty fan motor.
Hydraulic hose fittings not tight.
Motor bolts not tight.
Faulty fan motor shaft seal.
Faulty fan motor.
Return line not connected.
Shaft seal failure on hydraulic
motor seal.
Tractor is not putting out adequate
oil.
Hydraulic motor malfunction.
Tractor hydraulic valve not retained
in detent position.
Solution
Switch pressure & return hoses.
Check and install correctly.
Repair tractor.
Reconnect hoses.
Install lever stop in tractor console.
Re-cut lever stop.
Tractor SCV linkage must be
readjusted.
Install auxiliary return line coupler
kit in SCV.
Replace control valve.
Add oil.
Repair motor.
Apply thread sealant and tighten.
Tighten motor bolts.
See your dealer. Some wetness is
expected.
Return for service. See your dealer.
Connect return line, replace motor
seal.
Replace seal. WARNING: DO NOT
DISASSEMBLE HYDRAULIC
MOTOR!! THE SHAFT SEAL S AN
EXTERNAL REPLACEMENT ITEM.
Have tractor dealer inspect tractor
hydraulics. Bad couplers. Check
couplers on tractor and hoses. Try
different couplers.
Repair or replace motor.
Adjust valve detent.
TROUBLESHOOTING