4 – 60 Repair Manual RRE140/160/180/200/250 © BT
Functions and parameters
Hydraulic system 6000
T-code Valid from serial number Date Publication No.
815, 816 6051502 2008-08-21 261828-040
Calibration and adjustment of lowering and lift valves
The lowering valves for main lift Q4 and free lift Q5, and the lift valves
for main lift Q2 and free lift Q3 need calibrating to operate to their opti
-
mum.
For the lowering valves Q4 and Q5, the opening point must be calibrat-
ed, using CID in servicemode, see “ Free lowering and main lowering
valve calibration” on page 13 – 14. The opening point determines the
lowest lowering speed.
For the lowering valves Q4 and Q5, also the maximum opening point
that determines the maximum lowering speed, must be mechanically
adjusted
, see “14.2.3 Adjustment of maximum opening point” on
page 14 – 10.
For the lift valves Q2 and Q3, the opening point must be calibrated. For
the lift valves the opening point is very important for maintaining opti
-
mum transition from free lift to main lift.
Emergency lowering valve
On the top of the valve block is an emergency lowering valve (arrow) for
the mast. Both the main lift cylinders and the free lift cylinder are con
-
nected to the emergency lowering valve.
The emergency lowering valve is opened by loosening a 3 mm allen
screw in the valve block. The screw only needs opening 1½ turns to
activate emergency lowering.
IMPORTANT!
The screw must only be tightened to 2.5 Nm on closing.
Other valve blocks
Located in the fork carriage is a valve block in one of two versions - for
fork tilt and sideshift, or for fork tilt and extra functions.
Apart from these valve blocks there is the option of an additional one or
two extra hydraulic functions using an extra valve block in one of two
versions - for one or two hose reels.
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