1 - Hjallerup Maskinforretning A/S

SOFT DRIVE
Description / Control
Fig.1
When the SOFT DRIVE is engaged and the shut-off
valve open, the gas in accumulator A will be compressed.
The accumulators can now be checked by
measuring the movement of the rams under different
strains (static) at two different pressures.
Since the temperature of the oil and the diameter of the
rams affect this movement, below table will serve as
guidance.
Accumulator B will slow down the movement of the
beam in the opposite direction (UPWARDS).
CHECK OF ACCUMULATOR (A)
1) Connect a manometer to the hose from the loader lift
rams (the +side) (BLUE hose) with the shut-off valve
in OPEN position.
2) Oil temperature - about 20° C.
3) The bucket shall be loaded in such a way that a
pressure of 100 bar is achieved.
4) Measure the distance between the cylinder bearing
and the piston rod bearing (X).
5) Reduce (empty) the load to achieve a pressure level
of 50 bar.
6) Measure the distance between the cylinder bearing
and the piston rod bearing (X). NOTE ! do NOT lift /
lower beam between measurements.
7) The movement (min.) of the piston rod shall comply
with the values specified in below table (A).
ENGLISH (117-501)
CONTROL OF ACCUMULATOR B
1) Connect a manometer to the hose from the loader lift
rams (the -side) (GREEN hose).
2) Push the front part of the implement towards the
ground with the bucket ram until a pressure of 100
and 50 bar respectively has been achieved.
3) Measure the movement of the piston rod and compare
with the values below (B).
NOTE !
The warranty period for the accumulators is limited to
twelve (12) months. Depending on the extent of use, the
gas will diffuse in course of time. In such cases the
accumulator must be exchanged.
1
The following values apply at an oil temperature of 20°C
CYL. Diam.
Movement of piston rod ( 100 - 50 bar)
Ackumulator (A) Ackumulator (B)
65/40 mm 10 - 11 mm 18 - 19 mm
70/40 mm 9 - 10 mm 14 - 15 mm
75/40 mm 8 - 9 mm 11 - 12 mm
80/40 mm 15 - 16 mm 10 - 11 mm
90/40 mm 12 - 13 mm 7 - 8 mm
90/50 mm 12 - 13 mm 8 - 9 mm
117