Functions and parameters
Functions
Publication No. Date Valid from serial number T-code
261828-040 2008-08-21 6051502 815, 816
© BT Repair Manual RRE140/160/180/200/250 4 – 51
4.8.8 Hydraulic system
This section describes the standard functions of the hydraulic system.
Definitions
The various ranges for fork movement are free lift, transition and main
lift.
Free lift is the range where only the free lift cylinder is working.
Transition is the range where both the free lift and main lift cylinders
work. When the forks are raised through the transition range, lifting is
increasingly taken over by the main lift cylinders, with simultaneous
slowing of the free lift cylinder, as the forks approach the upper limit of
the transition range.
The main lift is the range beyond the free lift range where only the main
lift cylinders work.
Note that free lift, transition and main lift denote the ranges, and not the
extent to which the forks move up or down.
Controls
All control values are sent from the CID to the MCU via CAN.
The control that operates the function must be registered as unaffected
after start-up and before the function is used.
Lift
The mast and the forks' position in the mast are detected.
The main positions are free lift, transition up towards main lift, main lift
and transition down towards free lift.
Free lift and main lift use separate valves. For this reason, they can be
used simultaneously in the transition range.
Monitoring:
• Lift speed is reduced when battery capacity is low.
• The lift control is checked to ensure it is within 0.3 – 4.7 V.
• The electrical circuits of the lift and lowering valves are monitored for
short circuits and breaks in the cabling.
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