Yetter Systems One Seed Jet II Closed Center Hydraulic System - Manual (Page 10)

10
Problem
Blower speed is uneven.
Hydraulic oil is too hot.
Hydraulic control lever in tractor
not holding detent position.
No seed being transferred.
Airlock will not turn.
Cause
Operating with open center
hydraulic system.
Tractor oil filters are plugging.
Low hydraulic fluid level in
tractor.
Faulty flow control valve.
Insufficient oil cooling.
Plugged cooling radiator.
Cooling radiator is too small.
No cooling radiator.
Oil reservoir is too small.
Oil bypass rate is very high.
Low hydraulic fluid level in the
tractor.
Hydraulic line pressure exceeds
the detent setting.
Pressure spikes in the hydraulic
system.
Faulty detent mechanism.
Seed gate closed.
Tractor oil cold.
Seed hose plugged.
Low power to electric motor.
Airlock vane blocked.
Faulty electric motor.
Module switch open.
Poor or damaged wiring.
Blown fuse.
Module switch out of adjustment.
Faulty remote switch.
Failed module.
Solution
Recommend closed center or
load sensing system.
Service tractor hydraulic filters.
Maintain adequate oil levels.
Service tractor hydraulic system.
Review fan drive requirements.
Clear radiator cooling fins.
Increase cooling capacity.
Add cooling capacity.
Increase reservoir size.
Reduce bypass rate. Increase
fan speed.
Maintain adequate oil levels.
Hold the lever to maintain
operating position.
Operate selector and spool
valves gently.
Service as required.
Open gate.
Run tractor to warn oil.
Disconnect hose and clear.
Check wiring connections.
Check battery voltage.
Remove blockage. Example: wet
seed.
Test/Replace electric motor.
Blower not running.
Inspect and repair motor module
and switch wiring and
connections.
Module fuses.
Adjust so switch is open when
blower not running. Closed when
blower is running.
Replace remote switch.
Replace relay or module.