Minnich A-4SC User manual
Form: MM-A4/A5SC Revised 07/13/16
A-4SC/A-5SC Dowel Drill
Operator/Service Manual
Hours of Operation
7:30AM to 4:00PM Mon. – Fri. Eastern Standard Time
1444 State Route 42 Phone: 419.903.0010
www.minnich-mfg.com Toll Free: 800.524.1033
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Form: MM-
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4/A5SC Revised 07/13/16
TABLE OF CONTENTS
Section Page #
WARRANTY------------------------------------------------------------------------------------------------------ 4
GENERAL SPECIFICATIONS------------------------------------------------------------------------------- 5
GENERAL SAFETY RULES--------------------------------------------------------------------------------- 7
WORK AREA-------------------------------------------------------------------------------------------- 8
PERSONAL SAFETY --------------------------------------------------------------------------------- 8
TOOL USE AND CARE------------------------------------------------------------------------------- 8
SERVICE------------------------------------------------------------------------------------------------- 9
SAFETY DECAL PLACEMENT----------------------------------------------------------------------------10
DRILL STEEL AND BITS------------------------------------------------------------------------------------14
WARRANTY--------------------------------------------------------------------------------------------14
GENERAL NOTES------------------------------------------------------------------------------------14
DRILL STEEL AND BITS IN STOCK-------------------------------------------------------------15
USAGE CALCULATION-----------------------------------------------------------------------------16
BIT INSTALLATION AND REMOVAL------------------------------------------------------------16
SET-UP PROCEDURE ---------------------------------------------------------------------------------------17
RECOMMENDED LUBRICANTS--------------------------------------------------------------------------17
OPERATION PROCEDURE --------------------------------------------------------------------------------18
TROUBLE SHOOTING---------------------------------------------------------------------------------------19
CYLINDER SERVICE KITS ---------------------------------------------------------------------------------21
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Form: MM-
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4/A5SC Revised 07/13/16
TABLE OF CONTENTS CONTINUED
Section Page #
PART BREAKDOWNS
PLUMBING DIAGRAM -----------------------------------------------------------------------------------22
RAIL ASSEMBLY A11744-00028----------------------------------------------------------------------28
DRILL SUPPORT 0A9776-00019 ---------------------------------------------------------------------29
DRILL MANIFOLD ASSEMBLY A12592-00000----------------------------------------------------30
MULTI FUNCTION MANIFOLD ASSEMBLY A12593-00000-----------------------------------31
FEED MANIFOLD ASSEMBLY A12594-00000----------------------------------------------------32
TRAVEL CIRCUIT ASSEMBLY A12595-00000----------------------------------------------------33
VALVE 011549-00000------------------------------------------------------------------------------------34
TRAVEL VALVE 011526-00000 -----------------------------------------------------------------------35
VALVE 010935-00000 & 010936-00000-------------------------------------------------------------36
VALVE 011525-00000------------------------------------------------------------------------------------37
VALVE 010925-00000------------------------------------------------------------------------------------38
MARKER ASSEMBLY A10940-00000 ---------------------------------------------------------------39
POINTER & MARKER 0A6964-00000----------------------------------------------------------------40
PRESSURE REGULATOR 002880-00000----------------------------------------------------------41
PRESSURE REGULATOR 011703-00000----------------------------------------------------------42
LUBRICATOR 003843-00001 --------------------------------------------------------------------------43
AIR MOTOR 005392-00001-----------------------------------------------------------------------------45
LIFT GROUP------------------------------------------------------------------------------------------------46
SPROCKET REDUCTION 0A5910-00007 ----------------------------------------------------------47
DRIVE MOTOR AND SPROCKET 0A5875-00002------------------------------------------------48
STEERING SPINDLE 0A5918-00002 ----------------------------------------------------------------49
DRIVE ASSEM. A10020-00004, A10021-00004 & A10022-00005 ---------------------------50
CRAB AND STEERING GROUP A10050-00003--------------------------------------------------51
CASTER 0A5934-00005---------------------------------------------------------------------------------52
50# (23kg) ROCK DRILL 0A9350-00000 ------------------------------------------------------------53
ON GRADE ATTACHMENT A10321-00002--------------------------------------------------------55
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Form: MM-
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4/A5SC Revised 07/13/16
MINNICH MANUFACTURING CO.
WARRANTY AND SERVICE AGREEMENT
Minnich Manufacturing Co. warrants to the original purchaser that, if any part of the product proves defective in material or
workmanship within 90 days from purchase, and is returned to Minnich Manufacturing Co. within 90 days after the defect
is discovered, Minnich Manufacturing Co. will at its option repair or replace said part. Product shipped to Minnich
Manufacturing Co. freight prepaid will be returned freight prepaid. Product shipped to Minnich Manufacturing Co. freight
collect will be returned freight collect.
LIMITATIONS:
Warranty does not apply to repairs that are required because of normal wear or tear, parts or products that are damaged
as a result of misuse, neglect, accident or fire, or of lightning, flooding or other acts of God, or by improper installation or
maintenance, of which Minnich Manufacturing Co. will be the sole judge. Warranty does not apply to parts or products
that have been modified by an unauthorized party that has in Minnich Manufacturing Co.’s judgment affected their
performance or reliability. Warranty does not apply if the part or product substantially fulfills the performance
specifications.
Minnich Manufacturing Co. shall not in any event be liable for the cost of any special, indirect, or consequential damages
as a result of this product.
SERVICE:
Out of warranty service is available through Minnich Manufacturing Co.
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Form: MM-
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4/A5SC Revised 07/13/16
A-4SC/A-5SC Multiple Drill,
Self Propelled On Slab Unit
Specifications shown are standard. Variations to the standard are
available.
Horizontal and Vertical drilling
Skew drill bed is available on the A-4SCW
On grade kit is available
Capable of towing air compressor
Power crab steering
Power steering
Power brakes
Hole Spacing Pointer
Solid rubber tires
Adjustable drill height, depth and centers
Auto control
Dust collection is available
Model A-4SC/
A-5SC
Drill Steel Shank .875” x 4.25”
(22.2mm x 107.9mm)
Drill Steel Length U.C. 24” (61.0cm)
Drill Bit Diameter .625” – 2.50”
(15.9mm to 63.5mm)
*Maximum Drill Depth 18” (45.7cm)
Drill Distance
From Top of Slab 3.5” – 12”
(8.9cm to 30.5cm)
Minimum Cutout Width 48” (121.9cm)
SCFM Required Per Drill 92.2 (43.5D m3/sec)
PSIG Required 110 (7.58 BAR)
Weight A-4SCW (basic) 3260lbs. (1433kg)
Weight A-5SCW (basic) 3460lbs. (1569kg)
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Form: MM-
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4/A5SC Revised 07/13/16
*Based on 2 piece steel and bits. Whirlybits should be 1” (2.5cm) longer for maximum drilling depth.
GENERAL SPECIFICATIONS CONT
Pneumatic Connection:
An approved air disconnect is required to be installed in accordance to all Local and National
Codes.
Environmental:
+5°C to +40°C (+41°F to +104°F)
50% Rh at +40°C (+104°F), (90% Rh at +20°C (+68°F))
Altitude – 1000m (3280ft) above mean sea level
Unit is to be disposed according to all Local and National Regulations
Transportation and Storage:
-25°C to +55°C for 24 hours (-13°F to +131°F)
Ingress Protection:
Protection level IP2X is provided
Sound:
System operates at sound levels about 85dBA and 85dBC. Hearing protection is required.
System Nameplate:
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Form: MM-
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4/A5SC Revised 07/13/16
GENERAL SAFETY RULES
This manual contains NOTES, CAUTIONS, and WARNINGS. These MUST be followed to
prevent the possibility of improper use, incorrect servicing, damaging the equipment, or
personal injury. Read and comply with all NOTES, CAUTIONS and WARNINGS included in
these instructions.
NOTE: Notes contain additional information important to the operation of
the equipment.
CAUTION: Cautions provide important information to prevent mistakes
that could result in damage to the equipment.
WARNING: Warnings alert one to practices or conditions that could
lead to personal injury or death!
WARNING
Read and understand all instructions.
Failure to follow all instructions listed below may result in serious injury.
WARNING
DO NOT USE TOOL IF IT IS IN NEED OF SERVICE!
SAVE THESE INSTRUCTIONS
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Form: MM-
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4/A5SC Revised 07/13/16
- WORK AREA –
Keep your work area clean and well lit.
Cluttered and dark areas invite accidents.
Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control.
- PERSONAL SAFETY -
Stay alert, watch what you are doing and use common sense when operating a power tool. DO NOT use tool
while tired or under influence of drugs, alcohol or medication.
A moment of inattention while operating power tools may result in serious personal injury.
Dress properly. DO NOT wear loose clothing, or jewelry. Tie up long hair. Keep your hair, clothing, and gloves
away from moving parts.
Loose clothes, jewelry, or long hair can be caught in moving parts.
Avoid accidental starting. Be sure switch is off before connecting.
Connecting tools that have switches on invites accidents.
DO NOT overreach. Keep proper footing and balance at all times.
Proper footing and balance enables better control of the tool in unexpected situations.
Use safety equipment. Always wear eye and hearing protection.
Dust mask, non-skid safety shoes, hard hat, or hearing protection must be used for appropriate conditions.
Prolonged exposure to loud noise can cause impairment or loss of hearing. Wear suitable hearing protection
device such as earmuffs or earplugs.
Keep a first-aid kit near the power tool.
Safety depends on you.
- TOOL USE AND CARE -
Only qualified persons should operate the power tool.
Make sure you operate and service your power tool correctly.
DO NOT force tool. Use the correct tool for your application.
The correct tool will do the job better and safer at the rate for which it is designed.
DO NOT use tool if switch does not turn it on or off.
Any tool that cannot be controlled with the switch is dangerous and must be repaired.
Disconnect the tool from the power source before making any adjustments, changing accessories, or storing the
tool. Such preventive safety measures reduce the risk of starting the tool accidentally.
Store tools out of the reach of children and other untrained persons.
Tools are dangerous in the hands of untrained users.
Maintain tools with care. Keep tools clean.
Properly maintained tools are less likely to bind and are easier to control.
Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect
the tools operation. If damaged, have the tool serviced before using.
Many accidents are caused by poorly maintained tools.
Use only accessories that are recommended by the manufacturer for your model.
Accessories that may be suitable for one tool may become hazardous when used on another tool.
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Form: MM-
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4/A5SC Revised 07/13/16
- SERVICE -
DO NOT run the drill unit while you make adjustments and repairs unless the procedure is approved.
Escaping fluid and air under pressure can have sufficient force to penetrate the skin causing serious personal
injury.
If injured by escaping fluid or air, see a doctor at once. Serious infection or reaction can develop if proper medical
treatment is not administered immediately.
Before disconnecting lines, be sure to relieve all pressure. Before applying pressure to the system, be sure all
connections are tight and that lines, tubes and hoses are not damaged.
DO NOT use your hand to search for leaks.
Use a piece of cardboard or wood to search for suspected leaks.
Tool service must be performed only by qualified repair personnel.
Service or maintenance performed by unqualified personnel could result in a risk of injury.
When servicing a tool, use only identical replacement parts.
Use of unauthorized parts or failure to follow maintenance instructions may create a risk of injury.
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Form: MM-
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4/A5SC Revised 07/13/16
A-4SC/A-5SC Safety Decal Kit Placement (011387-00001)
012287-00005
Found in Decal Kit
011387-0000
W
012287-00003
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Form: MM-
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4/A5SC Revised 07/13/16
A-4SC/A-5SC Safety Decal Kit Placement Cont.
012287-00006
012287-00062
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Form: MM-
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4/A5SC Revised 07/13/16
A-4SC/A-5SC Safety Decal Kit Placement Cont.
012287-00010
Found in Decal Kit
011387-0000
W
012287-00007
012287-00001
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Form: MM-
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4/A5SC Revised 07/13/16
A-4SC/A-5SC Safety Decal Kit Placement Cont.
012287-00009
012287-00064
Found in Decal Kit
011387-0000
W
Found in Decal Kit
011387-0000
W
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Form: MM-
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4/A5SC Revised 07/13/16
Drill Steel and Bits
Warranty Policy
All drill steel and bits sold to customer are intended for use in drilling concrete. It is not
capable of drilling through steel mesh, rebar or dowel bars. Use in these applications
will void all warranties and dramatically shorten bit life. Bit life is also affected by the
sharpness of the bit, type of aggregate and condition of concrete. Minnich
Manufacturing’s drill steel and bit warranty is limited to the warranty provided by the
supplier. All warranty claims must be submitted to Minnich for evaluation and sent to
the supplier for authorization.
General Notes
1. 2” (50.8mm) diameter maximum bit for hydraulic drills.
2. 2 1/2” (63.5mm) diameter maximum bit for pneumatic drills.
3. 5/8” (16mm) diameter is the smallest hole diameter.
4. Cutting speed varies from 15 to 30 seconds for a 6” (152.4mm) deep hole,
depending on bit diameter and aggregate.
5. On average you can get 180 holes, 9” (228.6mm) deep per bit.
6. On average you can get 600 holes, 9” (228.6mm) deep per drill steel.
7. Removable bits are carbide and
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Form: MM-
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4/A5SC Revised 07/13/16
cannot be re-sharpened.
8. Whirly bit steel can be re-sharpened twice.
Drill Steel & Bits In-Stock
1 Piece Steel & Bit (Whirly Bit)
Part Number Hole Diameter Shank Size UC Length
005367-12.00 5/8" (15.9mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
005367-24.00 5/8" (15.9mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
004209-12.00 3/4" (19.1mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
004209-24.00 3/4" (19.1mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
004541-12.00 7/8" (22.2mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
004541-24.00 7/8" (22.2mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
004745-12.00 1" (25.4mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
004745-24.00 1" (25.4mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
All 4 1/4” (107.9mm) shanks can be cut to a 3 1/4” (82.55mm) shanks
Tapered Steel
Part Number Shank Size UC Length Notes
003749-12.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
For 1” (2.54cm) Bits ONLY
003747-1.000
003749-24.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
004116-12.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm) For 1 1/8” (2.86cm) &
Larger Bits ONLY
004116-24.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
Tapered Bits
Part Numbe
r
Hole Diamete
r
Shim Part Numbe
r
Notes
003747-1.000 1" (2.54cm) 003839-00000 Use 003749-12.00 or
003749-24.00 Steel ONLY
003747-1.120 1 1/8" (2.86cm) 003901-00000
Use 004116-12.00 or
004116-24.00 Steel ONLY
003747-1.180 1 3/16” (3.01cm) 003901-00000
003747-1.250 1 1/4” (3.18cm) 003901-00000
003747-1.310 1 5/16” (3.34cm) 003901-00000
003747-1.370 1 3/8” (3.49cm) 003901-00000
003747-1.430 1 7/16” (3.65cm) 003901-00000
003747-1.500 1 1/2” (3.81cm) 003901-00000
003747-1.560 1 9/16” (3.97cm) 003901-00000
003747-1.620 1 5/8” (4.13cm) 003901-00000
003747-1.750 1 3/4” (4.45cm) 003901-00000
003747-1.810 1 13/16” (4.60cm) 003901-00000
003747-1.880 1 7/8” (4.76cm) 003901-00000
003747-2.000 2” (5.08cm) 003901-00000
All 4 1/4” (107.9mm) shanks can be cut to a 3 1/4” (82.55mm) shanks
“H” Thread Steel
Part Numbe
r
Shank Size UC Length
005061-24.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
05061B-24.00 1" x 4 1/4" (25.4mm x 107.9mm) 24" (61.0cm)
“H” Thread Bits
Part Numbe
r
Hole Diamete
r
Note
005140-1.370 1 3/8” (3.49cm)
005140-1.500 1 1/2” (3.81cm)
005140-1.620 1 5/8” (4.13cm)
005140-1.750 1 3/4” (4.45cm)
005140-1.870 1 7/8” (4.76cm)
005140-2.000 2” (5.08cm)
005140-2.250 2 1/4” (5.72cm)
005140-2.500 2 1/2” (6.35cm) Multiple use bit
All 4 1/4” (107.9mm) shanks can be cut to 3 1/4” (82.55mm) shanks
- 16 -
Form: MM-
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4/A5SC Revised 07/13/16
Usage Calculation
The calculations below are nominal and could vary depending on the hardness of the
concrete, aggregates used and the possibility of bits hitting steel reinforcement.
Whirly Bit, Taper Bit and “H” Thread Bit
(B)Bit=180 holes x 9” (22.86cm)
B=1620” (4114.8cm)
Number of bits needed = (number of holes x hole depth)/1620”
Taper Steel and “H” Thread Steel
(S)Steel=600 holes x 9” (22.86cm)
S=5400” (13716cm)
Number of steels needed = (number of holes x hole depth)/5400”
Example:
Need 50,000 Holes 12” (30.48cm) Deep for the job.
(50,000 x 12)/1620 = 371 Bits
(50,000 x 12)/5400 = 112 Steels
Drill Bit Installation
1. Check to see that the hole through the center of the drill steel is not blocked, if so
remove the object.
2. Clean the tapered end of the drill steel and the inside of the drill bit with a non-
oily cleaner, making sure not to leave any oily residue.
3. Make sure a brass shim is in the drill bit. If not, carefully roll a new one and slide
it into the bit making sure that the ends do not overlap.
4. Put the drill bit on the tapered end of the drill steel and tap it on a firm surface to
seat the bit.
Drill Bit Removal
1. Swing latch so that drill steel can be removed from drill.
2. Pull drill steel out of drill.
3. Using two hammers, place one hammer on bottom side of bit. Using other
hammer, strike the bit on the topside. Rotate drill steel 1/4 turn and strike top of
bit again. Repeat procedure until bit comes off.
CAUTION: Bit may pop off of drill steel with some force.
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Form: MM-
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4/A5SC Revised 07/13/16
A-4SC/A-5SC Set-Up Procedure
1. CAUTION Before connecting the air compressor:
a. Make sure that all lock pins are in their locked position.
b. Make sure all controls are in the “off” position and the lift lever (if so equipped) is in the “up” position.
c. Make sure the lubricator is filled with proper lubricant. See recommended lubricants below.
d. Make sure air line is cleaned out and is of the proper size and pressure rating for the drill unit.
e. Make sure that the air compressor is set at an operating pressure of not more than 120 PSIG (8 Bar).
f. Install the drill steel and bits into the drill motors and close the latch retainers and rod guides.
2. Connect the air line to the drill in accordance with hose connection instructions.
3. Start the compressor in accordance with manufacturer’s instructions.
4. Position the drill unit where the first set of holes is to be drilled, keeping the drill unit back from the edge of the slab
slightly. Set the brake if so equipped.
5. With the lift lock still engaged, charge the lift cylinder by toggling the lift lever up and down.
6. With the lift valve in the up position and after making sure that there are no obstructions in the path of the drill bed,
remove the lift lock pin.
7. Using the lift lever, lower the drill bed into the drilling position.
8. Measure the drilling position from the top of the slab to the center of the drill steel. If necessary loosen the locknuts
and, using the adjusting screws to raise or lower the drill bed to the proper drilling position. Tighten the locknuts.
9. Check to make sure the drill bed is parallel with the slab that is to be drilled into. If necessary, loosen the locknut on
the lift cylinder and turn the adjusting screw in or out to align the drill bed with the slab to be drilled.
10. To set the drill depth, remove all the rail locking pins and feed the drill bit into the face of the slab without turning on
the drills.
a. On Standard Machines: Measure the distance between the drill stop rod and the drill stop pad. Adjust the
stop bolt so that the distance between the stop pad and the stop bolt equals the drill depth.
b. On Wireless Machines: Measure the distance that the feed cylinder rod extended. Add this distance to the
required drill depth. Measure along the feed cylinder tube from the trunnion end to the position sensor;
adjust the sensor so that it is set at the distance determined above. Note: After drilling the first hole with
each drill, it is recommended to measure the actual drill depth and then readjust the position sensor
accordingly.
11. Set the feed regulator to 20-24 PSIG (1.4-1.7 Bar).
12. See operating instructions to drill the first set of holes.
RecommendedLubricantsForRockDrills
SupplierAmbientTemperature(EquivalentSAE)
Below4˚C4˚‐36˚Above36˚
(SAE10W) (SAE20,30)(SAE40)
AGIPProduct
RockDrill
RD100
CaltexProduct
RPMVistacOil32XRPMVistacOil RPMVistacOil
orRockDrillLube46100X320X
TexacoProduct
RockDrillRockDrillRockDrill
Lube46Lube100Lube320
Chevron
Product
VistacOilVistacOilVistacOil
32X100X320X
MobilProduct
AlmoOilAlmoOilAlmoOil
No.1No.2No.5
Shell
ShellTonaOilShellTonaOil
R100R320(150)
***DONOTUSEENGINEOIL,DIESELORHYDRAULICFLUID***
- 18 -
Form: MM-
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4/A5SC Revised 07/13/16
A-4SC/A-5SC Operation Procedure
1. WARNING Wear proper safety equipment.
a. Flying Debris: During drilling, chips may be ejected.
b. Dust: Concrete dust will be ejected from the hole.
c. Loud Noise: Air compressor and drill unit will create loud noise levels.
d. Pinch Points: Keep clear of all moving parts.
2. Operator should stand in a safe location with good visibility, not less than 10 feet (3 meters) from the closest point
on the machine.
3. Place feed lever(s) in the “in” position to move the bits against the face of the slab.
4. Place the drill lever(s) in the “on” position to turn on the drill motors. Press the initiate lever is so equipped.
5. When drill motors reach the required depth, place the feed lever in the “out” position.
6. When the drill steel is clear of the hole, place the drill lever in the “off” position.
7. On units with the wireless control, the drills will automatically retract and shut off when the hole depth has been
reached.
8. Release the brake if so equipped. Position the drill for the next set of holes to be drilled. Reset the brake is so
equipped.
9. On units equipped with steering, turn the wheel or press the joy stick right or left to steer the unit right or left.
10. On units with the “crab” feature, it is helpful to turn the crab “on” and then steer right or left to keep the machine
tight against the face of the slab while repositioning the unit.
- 19 -
Form: MM-
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4/A5SC Revised 07/13/16
TROUBLE SHOOTING AIR DRILL
IF SYMPTOMS OF POOR PERFORMANCE DEVELOP, THE FOLLOWING CHART CAN BE USED AS A GUIDE TO
DETERMINE THE PROBLEM. WHEN DIAGNOSING FAULTS IN OPERATION OF THE AIR DRILL, ALWAYS CHECK
THAT THE COMPRESSOR IS SUPPLYING THE CORRECT SCFM AND AIR PRESSURE AS LISTED IN THE TABLE
PROBLEM CAUSE REMEDY
DRILL DOES NOT RUN
DRILL NOT GETTING AIR
1. ON MULTI DRILL UNITS, SWITCH AIRLINE WITH
DRILL THAT IS WORKING PROPERLY. IF DRILL
NOW RUNS CHECK THE AIR CONTROL VALVE.
IF THE VALVE WORKS, CHECK THE DRILL.
2. CHECK VALVE ON AIR COMPRESSOR AND
DRILL UNIT TO BE CERTAIN THEY ARE
COMPLETELY OPEN.
3. CHECK COMPRESSOR. IT SHOULD HAVE
100SCFM (47.2Dm³/sec) PER DRILL AND 110PSI
(7.6 BAR) AT DRILL MANIFOLD WHEN
DRILLING WITH LARGE DRILLS.
4. MAKE CERTAIN ALL FITTINGS ARE
CONNECTED PROPERLY AND NOT LEAKING.
COUPLING OR HOSE
OBSTRUCTION
REMOVE OBSTRUCTION.
FAILURE IN THE ELECTRICAL
CIRCUIT
CHECK SWITCHES, CONNECTIONS, COILS, GROUND &
VOLTAGE. IF THE POWER UNIT (BACKHOES, GRADER,
ETC.) IS BEING JUMP STARTED, CHECK THE AMPS &
VOLTAGE BEING SUPPLIED TO COILS FROM THE
BATTERY, IT MAY BE TOO LOW.
FAILURE OF DRILL SOLENOID
VALVE (MULTI DRILL UNITS WITH
REMOTE ELECTRICAL
CONTROLS)
CHECK VALVE - YOU SHOULD BE ABLE TO FEEL THE
SOLENOID MOVE WHEN IT IS ACTUATED. MAKE SURE
YOU HAVE CURRENT TO THE SOLENOID COIL.
REPLACE THE SOLENOID IF THERE IS NO MOVEMENT.
MECHANICAL FAILURE OF DRILL
DISASSEMBLE THE DRILL & INSPECT IT FOR
DAMAGED PARTS.
- 20 -
Form: MM-
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4/A5SC Revised 07/13/16
TROUBLE SHOOTING AIR DRILL
PROBLEM CAUSE REMEDY
DRILL RUNS SLOW OR DOES
NOT DRILL EFFECTIVELY
NOT ENOUGH AIR REACHING
DRILL. IT SHOULD HAVE
100SCFM (47.2dm³/sec) PER
DRILL AND 110 PSI (7.6 Bar) AT
DRILL MANIFOLD WHEN
DRILLING WITH LARGE DRILLS
ON MULTI DRILL UNITS, TURN OFF ONE OR TWO
DRILLS. IF THE REMAINING DRILLS PICK UP SPEED,
CHECK THE AIR COMPRESSOR.
RESTRICTION IN AIR LINE
A FOREIGN OBJECT IN THE AIR LINE OR POSSIBLY A
REDUCTION IN THE AIR LINE CAUSED BY A REDUCER
FITTING.
TOO SMALL AIR LINE
FOLLOWING ARE SUPPLY LINE SIZES FOR DRILLING:
A-1 SINGLE DRILL 3/4" (19mm)
A-2 TWO DRILLS 1-1/4" (31.75mm)
A-3 & A-4 THREE & FOUR DRILLS 1-1/2” (38.1mm)
A-5 FIVE DRILLS 2" (50.8mm)
AIR PRESSURE TO CYLINDER
“FEEDING” DRILL INTO
CONCRETE NOT ADJUSTED
PROPERLY
EXCESSIVE PRESSURE CAN CAUSE DRILL TO “BIND
UP” IN THE HOLE. PRESSURE THAT IS TO LOW WILL
NOT “FEED” THE DRILL INTO THE CONCRETE. THE AIR
PRESSURE REQUIRED VARIES WITH THE DRILL
MODEL.
HORIZONTAL – ALL UNITS WITH LARGE DRILLS USE
22-26 PSI (1.5-1.8 Bar). DRILL UNITS USING THE 15LB
(6.8kg) CLASS DRILL WILL USE 16-20 PSI (1.1-1.4 Bar).
VERTICAL – ALL DRILL UNITS USE 5-6 PSI (0.34-0.41
Bar). WITH THE CORRECT AIR PRESSURE, THE DRILL
STEEL SHOULD HAVE A SLIGHT RATTLE.
INSUFFICIENT AIR FLOW TO
KEEP HOLE BLOWN CLEAN
CHECK FOR OBSTRUCTION IN THE BLOW TUBE IN
THE DRILL.
LUBRICATOR PUTTING OUT TOO
MUCH OIL TO DRILL
IF YOU NOTICE MORE THAN A LIGHT FILM OF OIL ON
THE AIR DEFLECTOR ON THE BOTTOM OF THE DRILL,
ADJUST THE LUBRICATOR. MAKE CERTAIN YOU ARE
USING THE TYPE OF OIL CALLED FOR IN THE
OPERATION AND MAINTENANCE MANUAL.
MECHANICAL BINDING OF DRILL
CARRIER
MAKE SURE THE EIGHT BEARING PADS ARE
ADJUSTED CORRECTLY. THE SQUARE TUBE THAT
THE DRILL CARRIER SLIDES ON MUST BE FREE OF
RUST SO THAT THE CARRIER SLIDES FREELY. DRILL
STEEL MUST NOT BE BINDING IN THE GUIDE
BEARING.
BENT DRILL STEEL, WORN DRILL
BIT OR DRILLING INTO REBAR
REPLACE THE DRILL STEEL OR BIT. IF DRILLING INTO
REBAR, MOVE THE DRILL.
USING 3 1/4”(8.25cm) SHANK
DRILL STEEL IN 4 1/4” (10.8cm)
SHANK CHUCK DRILL
THE DRILL STEEL WILL ROTATE BUT IT WILL NOT
ALLOW THE DRILL PISTON TO HAMMER PROPERLY.
REPLACE IT WITH THE CORRECT 4 1/4” (10.8cm) DRILL
STEEL.
This manual suits for next models
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