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OPERATION
PRE-OPERATION PROCEDURES
CHECK POWER SOURCE
1. Using a calibrated flowmeter and pressure gauge,
check that the hydraulic power source develops a
flow of 4–9 gpm/15–34 lpm at 950–2000 psi/65–140
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 in-
stalled. Failure to install tool accessories 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 fittings 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 fittings or quick disconnects. Connect the
return hose first and disconnect it last to eliminate
or reduce trapped pressure for easier quick-connect
fitting attachment.
NOTE:
If uncoupled hoses are left in the sun, pres sure in-
crease within the hoses can make them difficult to
connect. Whenever possible, connect the free ends
of hoses together.
3. Observe the flow indicators stamped on the hose
couplers to ensure that the flow is in the proper di-
rection. The female coupler on the tool's IN port is
the inlet coupler. See illustration in back of this man-
ual for tool port identification.
4. Squeeze the drill trigger momentarily. If the drill does
not operate, the hoses might be reversed. Verify
correct connection of the hoses before continuing.
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 con-
necting it to an open-center circuit with the trigger re-
leased. If pressure rises more in the circuit with the trig-
10 ► HD01 User Manual
ger 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
decal on the trigger strut to remind you of the knob posi-
tions to select.
Failure to set this spool correctly can cause a
(CC)
operation.
mismatch with the hydraulic circuit. This can result
in rapid tool heating, seal failure, and poor tool
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 2.
Function Select - Hammer
Only, Drill Only or Combine
Hammer and Drill. Press mode
selector button (B) and turn the
IMPORTANT
performance.
Figure 2. Operator Controls
A
B
mode selector (A).
FWD
REV
Forward and Reverse
Select
C
C
C
Open-Center/
Closed-Center
Select
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