7
8. Fault Location
Start by checking the hydraulic settings
Before starting, check the oil level at the sight
glass.
Check the working pressure by means of the
test equipment. The test equipment com-
prises a pressure gauge, a flow meter and a
valve for adjustment of pressure.
The pressure relief valve is placed on the right side of the valve block.
1. Connect the test equipment, start the powerpack and move the lever to “ON”.
Then close the valve - the pressure gauge must show 150 bar.
If the pressure relief valve does not show 150 bar, adjust the valve by loosening
the lock nut and turning the adjustment screw in or out. “In” increases the
pressure, and “out” decreases the pressure.
Retighten the lock nut after adjustment.
2. When the pressure relief valve has been adjusted correctly, the working pressure
must be set at 100 bar by means of the valve on the test equipment. At 100 bar,
the oil flow should be 20 (30) l. p.m.
On the powerpack with POR, the flow is adjusted by loosening the POR cylinder
in the bracket and pushing it to the left (higher flow) or to the right (lower flow).
On the powerpack with adjustable flow, the flow is regulated by adjusting the
position of the throttle cable.
3. The number of revolutions must not exceed 3400 r.p.m. for the HHP09 at 20
l.p.m. and 3800 r.p.m. for the HHP13, when the powerpack is set at 30 l.p.m. If
the number is higher, there may be dirt in the pressure relief valve, or the pump
may be worn.
HYCON Test Equipment
Item No. 4040062
r.p.m. meter
Item No. 9992124
