Summit TX25H - Troubleshooting of Hydraulic System

I T L S E R V I C E M A N U A L
H-27
HYDRAULIC SYSTEM
H 8.0 TROUBLESHOOTING OF HYDRAULIC SYSTEM
DRAWBACK
CAUSES
REMEDIES
The Rockshaft lifts, jerkily.
Insufficient oil level in the tank.
Pump inlet filter clogged.
Infiltration of air into the pump, inlet pipe.
Clean or replace the filter. Check
the inlet pipe and any coupling and
gasket.
Top up the level
Rockshaft does not operate.
Adjusting piston or pilot valve stuck.
Remove the control valve and
unblock the pilot valve.
The Rockshaft does not descend
over its entire travel.
Sensibility adjusted badly.
Faulty adjustment of the control lever.
Adjust sensitivity of Control Valve,
Adjust sensitivity of Position lever.
The Rockshaft does not descend.
Hydraulic block switched on.
Outlet valve spring damaged
Piston Blocked.
Check piston and cylinder
Unscrew the manual lever
Change the spring.
Lifting capacity does not match
that-prescribed.
Safety-and over-pressure valves out of
calibration.
Poor Control Valve efficiency.
Deterioration of the Control Valve seal
rings.
Poor pump efficiency.
Replace the pump.
Control calibration of the 2 valves.
Remove the Control Valve and
replace the external seal rings.
Overhaul the Control Valve.
The Rockshaft supports loads with
difficulty, there is a rhythmic
oscillation when the motor is on
the load descends when the motor
is off.
Piston gasket worn.
Oil Leakage from cylinder.
Safety Valve,
Oil Leakage from one of the following
Non Return Valve
Control Valve,
Outlet Valve
Protecting the Cylinder.
Remove the Control Valve and
overhaul the following valves
Control Valve,
Replace the gasket.
Overhaul the Cylinder.
In case of Leakage over haul the
Control Valve.
Outlet Valve
Non Return Valve
Safety Valve,
When the arms are in the upper
position, the safety valve (Relief
Valve) placed on the body of the
Rockshaft starts operating.
Faulty adjustment of the max. upper
position of lift arms.
Adjust the control lever, limiting the
max. upper position travel.