Daedong CK22 - Troubleshooting; Power Lift Assembly

10-26
DS35-W00 May. 2007
CLUTCHCLUTCH CLUTCHCLUTCH
CLUTCH
TRANSMISSIONTRANSMISSION TRANSMISSIONTRANSMISSION
TRANSMISSION
ENGINEENGINE ENGINEENGINE
ENGINE
HSTHST HSTHST
HST
FRONT AXLEFRONT AXLE FRONT AXLEFRONT AXLE
FRONT AXLE
STEERINGSTEERING STEERINGSTEERING
STEERING
BARKEBARKE BARKEBARKE
BARKE
ELECTRICELECTRIC ELECTRICELECTRIC
ELECTRIC
INDEXINDEX INDEXINDEX
INDEX
HYDRAULICHYDRAULIC HYDRAULICHYDRAULIC
HYDRAULIC
GENERALGENERAL GENERALGENERAL
GENERAL
REAR AXLEREAR AXLE REAR AXLEREAR AXLE
REAR AXLE
CK22/CK22H
Provable Causes
• Insufficient oil level in the tank.
• Pump inlet filter clogged.
• Infiltration of air into the pump inlet pipe.
• Adjusting piston of pilot valve stuck.
• Sensitivity adjustment is incorrect.
• Faulty adjustment of the control lever
• Hydraulic block switched on.
• Outlet valve spring damaged.
• Piston Blocked
• Safety and over-pressure valves out of calibration
• Poor pump efficiency.
• Poor Control Valve efficiency
• Deterioration of the Control Valve seal rings.
• Piston gasket worn.
• Oil leakage from cylinder.
• Oil leakage from one of the following Control Valves
valves: 7 outlet valve, safety valve, protecting the
cylinder.
• Faulty adjustment of the max. Upper position of lift arms.
Symptom
The rockshaft lifts
jerkily.
Rockshaft does not
operate.
The rockshaft does
not descend over its
entire travel.
The rockshaft does
not descend.
Lifting capacity
does not match that
prescribed.
The rockshaft
supports loads with
difficulty; there is a
rhythmic oscillation
when the motor is
on; the load de-
scends when the
motor is off.
When the arms are in
the upper position,
the safety valve
(relief valve) placed
on the body of the
rockshaft starts
operating
3. TROUBLESHOOTING
3.1 POWER LIFT ASSEMBLY
Solution
Top up the level.
Clean or replace the filter.
Check the inlet pipe and
any coupling and gasket.
Remove the control valve
and unblock the pilot valve
and adjusting piston
(9.49 and 50)
Adjust sensitivity of Control
Valve
Adjust control position lever
Unscrew the manual lever
Change the spring
Check piston and cylinder
Control calibration of the 2
valves.
Replace the pump.
Overhaul the Control Valve.
Remove the Control Valve
and replace the external
seal rings.
Replace the gasket.
Overhaul the cylinder.
Remove the Control Valve
and overhaul the following
valves
In case of leakage over-
haul the Control Valve.
Adjust the control lever,
limiting the max. upper
position travel.
HYDRAULIC SYSTME - TROUBLESHOOTING