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PREOPERATION
PROCEDURES
CHECK POWER SOURCE
1. Using a calibrated fl owmeter and pressure gauge, check
that the hydraulic power source develops a fl ow of 4-9
gpm/15-34lpm at 950-2000 psi/66-140 bar.
2. Make certain that the hydraulic power source is
equipped with a relief valve set to open at 2100- 2250
psi/145-155 bar.
3. Check that the hydraulic circuit matches the tool for
open-center (OC) or closed-center
CHECK THE TOOL
1. Make certain all tool accessories are correctly installed.
Failure to install tool accessones properly can result in
damage to the tool or personal injury.
2. There should be no signs of leaks.
3. The tool should be clean and dry with all fi ttings and
fasteners tight.
CONNECT HOSES
1. Wipe all hose couplers with a clean lint-free cloth before
making connections.
2. Connect the hoses from the hydraulic power source to
the tool fi ttings or quick disconnects. Connect the return
hose fi rst and disconnect it last to eliminate or reduce
trapped pressure for easier quick-connect fi tting
attachment.
Note:
If uncoupled hoses are left in the sun, pres sure in-
crease within the hoses can make them diffi cult to
connect. Whenever possible, connect the free ends of
hoses together.
3. Observe the fl ow indicators stamped on the hose cou-
plers to ensure that the fl ow is in the proper direction. The
female coupler on the tool's "IN" port is the inlet coupler.
See illustration in back of this manual for tool port identifi -
cation.
4. Squeeze the drill trigger momentarily. If the drill does not
operate, the hoses might be reversed. Verify correct con-
nection of the hoses before continuing.
OPERATION
(CC)
operation.
10
DETERMINE TOOL MODEL
Open-center or Closed-center Models
Closed-center models have a closed-center decal
on the bottom of the handle.
If you are in doubt about the type, test the tool by connect-
ing it to an open-center circuit with the trigger released. If
pressure rises more in the circuit with the trigger released
than when the trigger is pulled, the tool is closed-center.
Open-center/Closed-center Selectable Models
The open-center/closed-center selectable model has a de-
cal on the trigger strut to remind you of the knob positions
to select.
IMPORTANT
Failure to set this spool correctly can cause a mis-
match with the hydraulic circuit. This can result in
rapid tool heating, seal failure, and poor tool perfor-
mance.
Note:
All models have a knurled knob on the spool. This
knob cannot be rotated on single-circuit type tools.
CONTROLS
FORWARD/REVERSE
Forward/Reverse rotation is selected by the lever on the
left-hand side of the tool, as shown in Figure 1.
Figure 1. Operator Controls
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