Wartungs- und Reparaturanleitung
Alphaclassic / Betaclassic
Maintenance and Repair Instruction
1118
1118.0XGB_ 06
Page: 14
Check valve (type 1118.03)
To test oil tightness of the valve (3) the function in question must be free from mechanical load and
supported to prevent it from moving.
To test oil tightness of the valves (3) the segment in question must be free from mechanical load and
secured.
Check valve (3):
Disconnect the hydraulic lines A and B of the valve to be tested at the
valve block. Close the open ends of the hydraulic lines.
Connect the pressure gauge along with the measurement adapter
of the hydraulic tool kit (3111.4913).
Actuate the function “up” (or “down”) at the hand control.
The pressure must rise to its maximum (100bar).
Release the button, the valve (3) must close.
The presssure of 100 bar must not drop below 70 bar within a period of 30 min.
See graph in the pressure diagram "Y"
If the pressure suddenly drops at the beginning by app. 10 bar
and remains constant thereafter, bleed the measuring lines and
repeat the measurement.
This procedure is applicable in the same way for all of the 3 valves.
Potentiometers for "0"-(Level) adjustment (1118.03 only)
B3/tilting, B4/trendelenburg
Supply voltage is 5 Volt – measured at the connected potentiometer between the red and the black
wire
The "0"-position refers to app. 2,5 Volt measured between the
red and the green wire
(voltage divider).
Troubleshooting:
- Function moves in the opposite direction when “0”-button is pressed:
→
Possibly red and black wire have been reversed.
- There is a continuous tone when the "0"-button is pressed:
A potentiometer is defective or positioned outside its permitted range (0,15.. 4,8V)
Re-adjust or replace.
3.5
1118.03
