SKIDRIL HD20 Application guide

UNIT SERIAL NUMBER
SKIDRIL
P.O. BOX 8041
GREENSBORO, NC 27419
TEL: [phone]
20
1-800-843-3745
OPERATION & PARTS
MANUAL
SKIDRIL
HYDRAULIC ROCKDRILL
MODEL HD20
ANY PERSON
OPERATING THIS
MACHINE SHOULD
READ AND
UNDERSTAND THIS
MANUAL FIRST!
FOLLOW ALL SAFETY
INSTRUCTIONS
Technical Data
MODEL HD20
WORKING PRESSURE 1600-1800 psi
MAX PRESSURE 2500 psi
WEIGHT 46 lbs
DIMENSIONS LxW 24-5/8” x 16-1/4”
TOOL CHUCK SIZE 7/8” x 4-1/4”
HOSE CONNECTION 3/8”
REQUIRED OIL FLOW 5.5-7 GPM
DRILL HOLE FLUSHING BUILT-IN
AIR COMPRESSOR
COMPRESSOR PRESSURE 29 psi
AIR DISPLACEMENT 28 CFM

CONTROL IDENTIFICATION 4
APPLICATIONS 5
OPERATION 6
MAINTENANCE 8
TROUBLESHOOTING 10
EXPLODED VIEWS & PARTS 15
WARRANTY/TIPS/SERVICE 18
TECHNICAL DATA 20
Contents
1Warranty Information
The production of SKIDRIL hydraulic equipment is based on many years of
experience and the use of high quality material which enables the equipment to
resist the mechanical and thermic stress occurring under normal working
conditions.
THE WARRANTY CEASES ON CHANGE OF OWNERSHIP OF THE EQUIPMENT AND IN
CASE OF REPAIRS UNDERTAKEN BY A NON-AUTHORIZED SKIDRIL SHOP WITHOUT
THE FACTORY’S EXPRESS AUTHORIZATION.
SKIDRIL dealer

5
WARNING!
*KEEP HANDS
AND FEET CLEAR
of moving parts of
rockdrill while in
operation!
*DO NOT stand
below rockdrill when
operating.
*DO NOT use the
rockdrill over your
head.
!
NOTICE!
*DO NOT use the
rockdrill in applications
for which it is not
intended!
* DO NOT operate
the rockdrill with
damaged or missing
parts or fasteners!
* DO NOT handle
rockdrill after long
periods of use without
wearing thick gloves
as the rockdrill may
become hot!
Applications
16
Parts List
The following constitute conventional and
acceptable uses for the HD20 hydraulic drill/
breaker.
1. Hand drilling up to a 3-1/2” diameter hole in
rock or concrete up to a depth of 5’ by
turning rotation control dial to vary rotation speed
up to 400 RPM..
2. Hand breaking rock or concrete by turning
rotation control dial (item G, page 4)
completely clockwise to stop drill rotation.
The following are considered unconventional uses,
and are therefore not covered under warranty.
1. Permanently mounting the rockdrill as in a
boom or truck-mounted application.
2. Using the rockdrill in underwater drilling
applications.
3. Using the rockdrill on a power source which
exceeds the stated required flow and pressure.
4. Dropping the rockdrill tool first into work.
i.e. - using the machine manually to hammer.
5. Using tools other than the specified
required size.
6. Using the rockdrill for any other purpose than
described in this section.

Operation Continued
NOTICE!
*DO NOT use
more than 25’ of
supply hose as
performance will be
reduced..
*DO NOT allow
bystanders within 20
feet of the drill while
in operation.
*DO ensure you
have safe footing
before starting the
drill.
*DO wear safety
boots, hard hat,
gloves, eye and ear
protection while
using the rockdrill.
*STOP operation if
you notice any oil
leaks.
*ALWAYS lay the
drill flat on the
ground while not in
operation.
*ALWAYS clip
quick-connect
couplings back
together to
minimize damage
7
14
Nitrogen Accumulator
8. Stop the hydraulic power source before
proceeding.
9. Disconnect the quick-connect couplings at
the rockdrill end. Connect both sets of
couplings to one another to keep the
connections clean and to minimize oil
leakage.
10. Open the drill stay and remove the tool.
11. Clean the air compressor filter per
maintenance instructions (see page 8).
12. Wipe remaining dust or oil from machine
before storing for the next job.
CHARGING THE NITROGEN ACCUMULATOR
WARNING! - Working with compressed nitrogen gas is
dangerous. SKIDRIL recommends this service be
performed during scheduled maintenance by an
authorized SKIDRIL Dealer. Should you decide to perform this
procedure yourself, call SKIDRIL to aquire a set of
detailed instructions and the proper equipment to use in
charging the nitrogen accumulator.
The nitrogen accumulator is a feature of the HD20 that requires regular
service. From time to time, as you notice the impact energy decrease
while using the machine, the nitrogen accumulator will need to be re-
charged with nitrogen gas. SKIDRIL strongly recommends sending your
unit into an authorized SKIDRIL dealer to have this service performed,
as this procedure is dangerous and should not be performed by
untrained or unqualified individuals. Should you decide to perform this
procedure yourself, call SKIDRIL for detailed instructions to follow before
beginning the procedure.
NOTICE!
Call SKIDRIL at [phone] before attempting any
maintenance to the nitrogen accumulator section (Item J, page
4) of the model HD20 rockdrill.

9
Maintenance Continued
12
Troubleshooting Continued
6. Oil leaks from control lever.
Inspection Point 200 Hours or
One Year 400 Hours or Two Years Over Three Years
Accumulator Gas
Pressure Check X
Replace Accumulator
Diaphragm X*
Replace U-Cup packing X*
Replace valve rod
O-ring X*
Replace Compressor
Piston Ring X
Replace Gear Case
Grease X*
Replace Motor Shaft
O-ring X*
Replace Every O-ring X*
SERVICE SCHEDULE
CAUSE SOLUTION
Worn or hardened O-ring. * Replace.
7. Oil is escaping with compressed drill flushing air.
CAUSE SOLUTION
Piston rod seal worn * Replace
Piston rod seal scratched. Replace or remove scratch.
8. Oil leaks from gear case assembly.
CAUSE SOLUTION
Motor shaft O-ring is worn. * Replace
Damaged packing * Replace
Motor housing O-ring worn. * Replace
9. Oil leaks from internal shaft.
CAUSE SOLUTION
Gear housing O-ring worn. * Replace.
* SKIDRIL strongly recommends having your model HD20
rockdrill serviced exclusively by a factory authorized SKIDRIL
service center. Due to extremely high manufacturing
tolerances, many service procedures require special tools
and/or techniques to be performed sucessfully and without
causing damage to other components of the rockdrill.

11
Troubleshooting Continued
10
Troubleshooting
CAUSE SOLUTION
Hydraulic power source is not
in operation, or selector valve
has not been turned on.
Start the power source and
switch selector valve to allow oil
to flow to rockdrill.
Disconnected hose. Connect the hose.
Quick coupling. Check the couplings.
Connections to rockdrill are
reversed. Check connections. With
rockdrill standing up, high
pressure should go into top
orifice, return should go to lower.
Relief valve setting on power
source too low Raise relief valve setting.
Broken control valve. * Replace.
Control valve malfunction. Disassemble drill, improve control
valve and valve body fitting and
eliminate foreign matter.
1. Drill does not operate when
control lever is depressed.
2. Drill hammers but will not rotate.
CAUSE SOLUTION
The rotation adjust dial is
turned fully clockwise (Closed
position).
Turn the knob counterclockwise
to achieve the desired drill speed.
The gear motor key is worn or
damaged. * Replace.
The gear motor is obstructed
by debris. Disassemble and clean.
3. Drill operates but strikes and rotates at slow rate.
CAUSE SOLUTION
Low hydraulic source flow rate. Increase flow rate by increasing
engine RPM on power source.
Relief valve setting on power
source is too low. Set to proper pressure.
4. Striking rate is normal, but impact is weak.
CAUSE SOLUTION
Low accumulator gas pressure. Increase pressure to 40 kg/cm2 by
charging with nitrogen gas. See
page 14 for imporatant note.
Broken accumulator diaphragm. * Replace.
5. Drill flushing air is weak.
CAUSE SOLUTION
The air cleaner element or
sponge is clogged with debris. Clean with soapy water, rinse,
wring out and replace.
Debris stuck in compressor lead
valve. Disassemble and remove debris.
Compressor piston ring is worn. * Replace
Compressor bushing is worn. * Replace.

13
Troubleshooting Continued
8
Maintenance
1. The rockdrill requires no lubrication other than that which is
automatically provided by the hydraulic fluid.
2. Check the hydraulic oil volume of the power supply to ensure the level
is sufficient for operation before each use.
3. Check the hydraulic oil condition after each use. Replace the oil if it
appears milky or changes color, or if it becomes sticky.
WARNING! - Do not touch hydraulic oil directly as it may be hot and is a
known carcinogen when absorbed through the skin!
4. The air cleaner sponge and element (see below) should be cleaned
after each use. Clean thoroughly with soapy water, rinse and wring dry.
Failure to do this will result in poor flushing of the drill cuttings, and
worse may result in premature wear of the
compressor cylinder, piston ring and valve.
HOOK
CLEANER ELEMENT
CLEANER SPONGE
CLEANER
COVER
10. Drill rod rotates but does not impact.
CAUSE SOLUTION
The rotation adjust knob is
turned fully counter-clockwise. Turn knob clockwise to achieve
desired impact.
Control valve is damaged. * Replace.
Piston is damaged. Replace the piston and
hammer.
* SKIDRIL strongly recommends having your model HD20
rockdrill serviced exclusively by a factory authorized SKIDRIL
service center. Due to extremely high manufacturing
tolerances, many service procedures require special tools
and/or techniques to be performed sucessfully and without
causing damage to other components of the rockdrill.
!

15
Exploded Views
6
Operation
PREPARATION FOR USE
1. Inspect all fasteners and ensure they are tight
before each use.
2. Inspect all hydraulic hoses, couplings and
fittings for wear or damage before each use.
3. Connect hoses of power supply to drill before
starting power source. Make sure connections are
clean and free of dirt or other debris before
connecting. Connect pressure side to top hose, and
the return side to the bottom hose. Confirm
connections are complete and secure before
proceeding.
4. Open the drill stay (item I, page 4) and insert
the tool appropriate for the application, drill steel
or breaker steel. Close the drill stay.
IMPORTANT NOTE: The air compressor
operates regardless of whether you are using the
machine to drill or break. Therefore, you must use
breaker tools which are slotted on the hex end to
allow the compressed air to
escape. Using standard breaker tools will
result in unsatisfactory breaking performance. Call
SKIDRIL for prices and availability of
slotted breaker tools.
5. Start the hydraulic power source and open flow
control valve to charge the circuit to the rockdrill.
6. Grip the machine by the handles. Ensure you
have safe footing before starting the drill by
pressing down on the control lever (item A, page
4). The drill will begin to operate.
7. When finished drilling, release the control lever.
WARNING!
*DO NOT operate
the rockdrill with
damaged hoses,
fittings or fasteners.
*DO NOT substitute
hoses for another
make/type.
*DO NOT stand
below rockdrill when
operating.
*DO NOT use the
rockdrill over your
head.
!
NOTICE!
*ALWAYS inspect
hoses, fasteners,
couplings before
each use!
*ALWAYS
connect both
hydraulic hoses to
the the tool before
starting the
power source!
* ALWAYS be sure
couplers are clean
and free of debris
before
NOTE: To find part numbers, cross-reference the numbers in the
exploded view below with the list of part numbers on the
following page.

17
Service Notes
4
Control Identification
A - CONTROL LEVER - Starts and stops drilling/impact function.
B - HANDLE GRIP - Used to control and support the drill.
C - AIR COMPRESSOR - Compresses air for flushing drill hole cuttings.
D - HYDRAULIC HOSES - Top is pressure, Bottom returns to power source.
E - COUPLINGS - Connect to power source hoses, or to each other when not in operation.
F - AIR CLEANER - Filters drill dust from air before entering compressor.
G - ROTATION ADJUST DIAL - Adjusts speed of rotation from no rotation to high-speed rotation.
H - GEAR MOTOR - Scavenges a portion of the hydraulic flow to rotate the drill steel.
I - DRILL STAY - Keeps tool or drill steel from slipping out of the machine.
J - NITROGEN ACCUMULATOR - Dampens recoil, increases impact energy.
Nitrogen Accumulator JA
B
C
D
E
E
F
G
H
I

Your SKIDRIL requires regular service (at least
annually) to maintain it in good running order, and
ensure long life.
How to obtain service:
Call SKIDRIL for a Repair Order number.
Toll-free [phone]
Where to obtain service:
SKIDRIL INC.,
Attn: Repair Order No. XXXXX
235 Labrador Drive
Randleman, NC 27317
19
Helpful Tips & Service
Cleaning the air filter element and sponge after
each use will greatly extend the service life of
the rockdrill.
To maximize driving power, do not use more
than 25’ of hose from the power source to the
rockdrill.
To prevent dirt from entering the quick-connect
couplings, and possibly damaging the breaker or
pack, be sure to clip couplings together after
disconnecting driver from pack.
SAFETY FIRST
READ, UNDERSTAND AND FOLLOW
SAFETY GUIDELINES AND SAFE WORK
PRACTICES.
Special
notice
goes here
TAKE NOTE OF WARNINGS IN THIS MANUAL
AS THEY IDENTIFY INSTRUCTIONS INTENDED
TO PREVENT INJURY TO YOU OR OTHERS.
NOTICES:, ARE INTENDED TO PREVENT
DAMAGE TO THE MACHINE OR PROPERTY.
WARNING!
DO NOT:USE EQUIPMENT IN APPLICATIONS FOR WHICH IT IS
NOT INTENDED.
DO NOT: USE IMPROPERLY TRAINED OR UNQUALIFIED
PERSONNEL TO OPERATE OR PERFORM REPAIRS ON THIS
EQUIPMENT.
DO NOT: LEAVE MACHINE RUNNING UNATTENDED OR WHEN
NOT IN USE.
DO NOT: REFUEL OR ADD HYDRAULIC OIL TO A HOT OR
RUNNING MACHINE.
DO NOT: SPILL FUEL OR HYDRAULIC OILWHEN FILLING THE
MACHINE.
DO NOT: SMOKE WHILE FUELING OR OPERATING MACHINE.
DO NOT: REFUEL NEAR AN OPEN FLAME OR SPARK.
DO NOT: OPERATE THE MACHINE WITHOUT PROPER SAFETY
PROTECTION SUCH AS PROTECTIVE EYEWEAR, SAFETY
BOOTS, EAR PROTECTION, HARD HAT, GLOVES ETC.
DO NOT: OPERATE THE MACHINE INDOORS OR IN AN AREA
WHERE EXHAUST GASES MAY COLLECT., OR WHERE
VENTILATION IS NOT ADEQUATE.
DO NOT:OPERATE THE MACHINE WITHOUT SOLID FOOTING OR
WITH THE MACHINE ELEVATED ABOVE YOUR HEAD.
DO NOT: STORE THE MACHINE IN A PLACE OR POSITION
THAT IT MAY FALL , DROP OR SLIDE FROM WHEN NOT IN USE.
DO NOT: OPERATE THE MACHINE WITH LOOSE, DAMAGED OR
MISSING PARTS.
!
NOTICE:
!