Jensen A528 - Hydraulic Construction; Wheels, Tyres

3
Chipping length
With hydraulic valve only – approx 20mm
With hydraulic capacitor regulator [A3.3 machine] – variable between 5mm – 20mm
(larger chip size on special request).
With regulator fitted, chip length can be continously regulated by turning the valve
screw. 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
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 A530/A528
23 litres for the A328/A340
23 litres for the A425
60 litres for the A231
64 litres for the A141
64 litres for the A10
Oil type: HLP ISC following DIN 51525
Service procedure
– The filter element should be changed after 20hrs 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:
A141 / A231 = 50 Litres / minute
A425 / A328 / A340 = 35 Litres / minute
A521 / A528 / A530 = 20 Litres / minute
Greasing insructions
Wood chipper Jensen
– Lubricate UJ's and feed roller bearings with Shell 'RETINAX A'
Note:
- Both rotor shaft bearings are grease filled for life (in normal working conditions) with
Lithium grease including anti corrosive and anti penetration properties (Class 3).