Jacobsen G-Plex III Safety, Operation And Maintenance Manual page 34

8 SETUP
If the cylinders drop too quickly or are not
synchronised correctly then they should be
adjusted accordingly.
The upper valve at the rear of the machine
(see Fig.8.4.2) adjusts the rate at which the
centre cutting unit rises.
The lower valve at the rear (see Fig.8.4.2)
adjusts the rate at which the centre cutting
unit lowers.
The valve under the battery cover (see
Fig.8.4.3) adjusts the rate at which the front
cutting units lower.
If it is not possible to get the sequencing of
the rear cutting unit correct this may be
because the side cutting units are set to lower
too slowly. Try increasing the speed of drop
slightly.
6. Once the cutting units are lifting and lowering
correctly tighten each of the grubscrews
found on the valves to lock the settings. Then
re-check the pressure as in step 5 and adjust
if necessary.
7. Finally remove the pressure gauge fitted in
step 1.
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JACOBSEN G-PLEX III Series: FH & FJ
SAFETY AND OPERATORS MANUAL