14 – 10 Repair Manual RRE140/160/180/200/250 © BT
Hydraulic system 6000
Main valve (6210)
T-code Valid from serial number Date Publication No.
815, 816 6051502 2008-08-21 261828-040
14.2.3 Adjustment of maximum opening point
When any of the proportional valves Q4 or Q5 are replaced, calibration
and adjustment are required. As in the calibration case, the forks shall
have a load of >500 kg.
The correct lowering motion shall be 0.53 m/s at an oil temperature of
20°
C.
1. Calibrate the valve, see “ Free lowering and main lowering valve
calibration” on page 13 – 14.
2. Lift the forks >2 m within the desired function’s, free lift/main lift, ac-
tion heights.
3. Use a measuring tape to read the exact fork height.
4. Lower the forks, by the means of fork lift/lower control lever in max-
imum lower position, for 2 seconds.
5. Measure the ending fork height. For 2 seconds of lowering, the
forks shall be lowered 1.06 m.
6. If the motion differs from 1.06 m, adjustment is necessary:
Release the locking nut by the means of a 10 mm key.
Use a 3 mm hex-Allen key to change the valve setting:
– CW decreases the lowering speed.
– CCW increases the lowering speed.
7. Tighten the locking nut and repeat the procedure until correct mo-
tion is reached.
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