3
Chipping length
The chipping length is adjustablebetween 5mm – 20mm by turning the regulator of
the hydraulic valve (larger chip size on special request).
Cutting length can also be affected by the temperature of the hydraulic fluid so that it
will be necessary to re-adjust during work.
Start - up of the hydraulic system after changing the hydraulic oil
Open the regulator or valve to the maximum position, but do not feed material into
the machine. In order to expel air from the system, run without load for 10/15
minutes, changing the valve/regulator position frequently (as if altering chip length).
Indications of air in the system are: foam in the oil reservoir (intermittent operation or
irregular motor speed), noise in the hydraulic system.
After setting up in this way, the system will work under pressure. Check the oil level,
and top it up if necessary.
Repeat this procedure after each oil change.
Note: Required oil viscosity is 30/50 cSt at 40'C.
Reservoir capacity:
18 litres for the A518
20 litres for the A521/A528/A530
23 litres for the A328/A340
27 litres for the A425/A428/A430
60 litres for the A231/A240
64 litres for the A041/141
64 litres for the A10
Oil type: HLP ISC following DIN 51525
Service procedure
– The filter element should be changed after 20 hours work from new, and
thereafter each 500 hours.
– A complete oil change is necessary after 1000 hours work.
– Check the oil level regularly.
– Take great care to avoid contamination of the hydraulic system with dirt and
dust when changing oil, filters, or affecting repairs.
– The hydraulic system is adjusted to 170 bars safety pressure, and protected by
a lead seal. Do not interfere with this!
– The working pressure is about 120 bars, depending on the type of material feed
into the chipper.
Note:
For chippers where the feed rollers are powered by tractor hydraulics, the following
oil flow rate is required:
A041 / A141 / A231 / A240 = 50 Litres / minute
A425 / A428 / A430 / A328 / A340 = 35 Litres / minute
A521 / A528 / A518 / A530 = 20 Litres / minute
Greasing instruction
Wood chipper Jensen
For detailed greasing instructions and intervals, please refer to the sheet
'Greasing instructions' which is part of this operating instructions.
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