8
English
Hoyer
®
HPL450 / HML450 Lifts
Fig. 6
Release Valve Knob
Pump Handle
Hydraulic Models Only:
6. Close the hydraulic unit release valve (Fig. 6) by turning the knurled black knob on the unit fully clockwise.
NOTE:
The release valve requires only minimal tightening to operate and should only be closed finger tight.
WARNING
DO NOT apply excessive force to the release valve knob as this will result in damage to the valve.
7.
Pump the handle (Fig. 10) of the hydraulic unit and confirm the ram raises the boom.
8.
Open the release valve fully anti-clockwise and check the boom descends.
NOTE:
An unloaded boom will not come down under its own weight, it will be necessary to apply some pressure to
the boom before it will descend.
WARNING
The release valve is fully open and encounters a positive end stop in less than two full turns of the knob. DO
NOT force the valve past the end stop as this will result in damage to the valve.
9.
Close the release valve by turning the knurled black knob clockwise.
10.
The lift is now ready for use.
