Cub Cadet 8454 - Manual (Page 199)

HYDRAULIC SYSTEM
6-5 D569-W02 May-2003
1.1 TROUBLESHOOTING
• Insufficient oil level in the tank.
• Pump inlet filter clogged.
• Infiltration of air into the pump
inlet pipe.
• Adjusting piston sticked.
• Badly adjusted force
transmission tie-rod (7).
• Outlet valve stuck.
• Deterioration of the distributor
box seal rings.
• Safety and overpressure valve
out of calibration.
• Poor pump efficiency.
• Poor distributor box efficiency.
• Piston gasket worn.
• Defective sensitivity valve.
• Defective overpressure valve.
• Non return valve defective.
• Faulty adjustment of controlled
position lever limit switch.
• Badly adjusted distributor
sensitivity.
• Badly adjusted draft control lever.
• Position lever completely out of
adjustment.
• Internal leverage faults.
• Top up the level.
• Clean or replace the filter.
• Check the inlet pipe and any
couplings and gaskets.
• Remove the distributor and clear
the adjusting piston.
• Adjust the controlled draft.
• Remove the distributor and clear
the outlet valve.
• Remove the distributor box and
replace the external seal rings.
• Calibrate the valves.
• Replace the pump.
• Overhaul the distributor box.
• Replace the gasket.
• Adjust sensitivity or replace the
valve.
• Remove the distributor box and
overhaul the valve.
• Remove the distributor box and
overhaul the valve.
• Adjust controlled position,
limiting the upward boom ravel.
• Adjust sensitivity.
• Adjust controlled draft operation.
• Adjust controlled draft operation.
• Overhaul the Rockshaft.
Symptom Probable Cause Solution
The Rockshaft lifts jerkily.
Rockshaft does not operate.
The rockshaft start to lift but stops
as soon as if feels the load, but
the overpressure valve does not
intervene.
The Rockshaft does not descend.
Lifting capacity does not match
that prescribed.
The rockshaft supports load with
difficulty :
There is a rhythmic oscillation
when the motor is on : the load
descends when motor is off.
With the booms in the upper end
stop position and the motor is on,
a rhythmic oscillation occurs : the
load does not descend with the
motor off.
When operating under controlled
draft, the implements in too much
or else comes out of the furrow.
Controlled draft does not function :
the rockshaft goes up and down
only with position lever.
Controlled position does not
function and the rockshaft goes up
and down only with the draft
control lever.