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Section 2 - Technical Specification
TECHNICAL SPECIFICATION
2.21
HYDRAULIC SETTINGS
1.
PRELIMINARY OPERATIONS
Check that the engine idle is set at 950 rpm and that
the engine maximum speed is set at 2300 rpm for
GTH 4017 EX and at 2200 rpm for GTH 4514EX, GTH
4013EX.
Warm up the hydraulic oil to 60°C by keeping one of the
elements of the boom main valve to full stroke under
pressure.
To reach this temperature in a faster way, cover the oil
core of the radiator with a carton in the case of a wateroil
combined cooler.
2.
CALIBRATING THE BOOM MAIN VALVE
Lift the boom and put the ring on the lift cylinder rod.
Open the rear carter and locate the main valve. Find
the mini-socket 2 (see annex 1) and fit a 0-400 bar
manometer. Using the joystick, with the engine running
at maximum speed, keep the lifting boom cylinder to full
stroke and set the valve A at 280 bar.
To check the safety valves B (see annex 1) proceed
as follows:
•
Increase the pressure of valve
to 300 bar moving the one of the cylinders to end
of stroke.
•
With the engine running at maximum speed, tilt
the forks to one direction by means of the joystick
and act on one of the two valves B until reaching a
pressure of 290 bar. Adjust the second valve B by
pitching the forks back.
•
When both fork inclination valves have been
calibrated, reset the pressure control valve A to 280
bar by adjusting the adjustment screw.
To check the set of the extension boom safety valve
(see annex 1), proceed as follow:
•
With the engine running at maximum speed, extend
the boom to end of stroke maintaining the position.
•
Set the valve
T at 200 bar for GTH 4514EX - GTH
4017EX.
•
Set the valve
T at 230 bar for GTH 4013EX.
16
A of the main valve
GTH-4017EX GTH-4514EX GTH-4013EX
CAUTION
For safety reasons, do not hold the cylinder to end
of stroke and do not let the engine run at max speed
for more than 5 seconds.
3.
CHECK
CALIBRATING
TRANSMISSION (ANNEX 3)
Do the calibration of the hydrostatic transmission with
the hydraulic oil at 60°C.
•
Connect a 0-60 bar manometer to the mini-socket
TP3 to read the boost pressure (see annex 3).
•
Connect a 0-60 bar manometer to the mini-socket
TP2 to read high pressure (see annex 3).
WARNING
During this operation, the operator has to be on the
side of the machine.
•
Hold the selector to neutral position and make sure
the maximum speed of the engine does not exceed
2350 giri/min. The engine must run at a idle speed
of 950 rpm. Otherwise, adjust the minimum speed.
•
Read the boost pressure on manometer
ensure it is about 24 bar with the engine running at
idle speed.
The boost pressure has not a fixed value but varies
from pump to pump. (from 20 to 29 bar)
•
Hold the machine blocked using the brake pedal,
disconnecting the incing electrical connection
located on the service brake under the cab.
•
Set the forward-neutral-reverse selector to the
forward position.
•
Run the engine at maximum speed.
•
Check the high-pressure value on the manometer
TP2 is 425 bar. (annex 3)
November 2008
HYDROSTATIC
TP3 and
Document 57.0009.0427
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