GB-11
JACOBSEN G PLEX II Series: ZV
MAINTENANCE AND PARTS MANUAL
GB
CUTTING HEAD LIFT AND LOWER TIMING
Cutting head lift and lower timing are controlled by the
sequence control and normal open limit switches.
The sequence control switch, located above the left
front cutting head, (See Fig. 23) allows hydraulic oil to
flow to the rear lift cylinder. This sets the proper
timing for the lifting and lowering between the front
heads and the rear head. The limit switches, located
above the rear cutting head, (See Fig. 23) shuts the
oil flow off when the rear cylinder is fully extended or
retracted.
1. With the cutting heads lowered and
cylinders fully retracted, check the
dimension of 1/16” (1.6mm) between the
cam and ear and the same dimension
between the switch bracket and ear (See
Fig. 23).
1
1/16" (1.6mm)
1/16" (1.6mm)
(CYLINDER FULLY RETRACTED)
HEADS IN LOWERED POSITION
LOCATED ABOVE LEFT FRONT CUTTING HEAD
2
3
Figure 23
1. Sequence Control Switch
2. Cam
3. Ear of Bracket
2. Once you have completed setting the
sequence control switch move to the limit
switches above the rear head (See Fig.
24).
3. With the heads lowered and cylinders fully
retracted check the dimension of 1/8”
(3.2mm) between the cam and ear. While
they are still retracted, check the
dimension of 8 7/16” (214mm) from pin to
pin (See Fig. 24).
NOTICE
• BE SURE the retract switch opens at 8 7/
16” (214mm) measured from pin to pin. If
it does not open, hydraulic pressure will
continue and damage the system. From
pin to pin check the dimension of 11 5/16”
(287mm) when the heads are raised and
the cylinders are fully extended (See Fig.
24).
NOTICE
• BE SURE the extend switch opens at 11 5/
16” (287mm) measured from pin to pin. If
it does not open, hydraulic pressure will
continue and damage the system.
2
1
11 5/16" (287mm) EXTENDED
8 7/16" (214mm) RETRACTED
1/8" (3.2mm)
LOCATED ABOVE REAR CUTTING HEAD
3
4
Figure 24
Normally Closed Limit Control Switches
1. Extend Switch
2. Retract Switch
3. Cam
4. Ear of Bracket
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