Cub Cadet 8454 Service Manual download pdf (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.

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