Instruction manual
& s
p
are parts list
CH-PRO 33 STRAIGHT
CH-PRO 25
CH-PRO SERIES
AIR DRIVEN
CHIPPING HAMMERS
Revision date: 02/2008
1.General Safety and Operation Instruction
1. Unpacking
When unpacking this product, carefully inspect for any damage that may have occurred during
transit. Make sure any loose fittings, bolts, etc., are tightened before putting this product into
service.
2. This product is a part of a high-pressure system and the following safety precautions must be
followed at all times along with any other existing safety rules.
3. Read all manuals included with this product carefully. Be thoroughly familiar with the controls
and the proper use of the equipment.
4. Only persons well acquainted with these rules of safe operation should be allowed to use the air
tool.
Do not exceed maximum operation pressure of the air tool (6.2BAR/90 PSI).
The air tool could explode and result in death or serious personal injury.
5. Do not exceed any pressure rating of any component in the system.
6. Disconnect the air tool from air supply before changing tools or attachments, servicing and
during non-operation.
7. Always wear safety glasses during operation.
8. Do not wear loose fitting clothing, scarves, or neckties. Loose clothing may become caught in
moving parts and result serious personal injury.
9. Do not wear jewelry when operation any tool. Jewelry may become caught in moving parts and
result in serious personal injury.
10. Do not depress trigger when connecting the air supply hose.
11. Always use attachments designed for use with air-powered tools.
Do not use damaged or worn attachments.
12. Never trigger the tool when not applied to a work object. Attachments must be securely
attached. Loose attachments can cause serious injury.
13. Protect airlines from damage or puncture.
14. Never point an air tool at oneself or any other person. Serious injury could occur.
15. Check air hoses for weak or worn condition before each use. Make sure all connections are
secured.
1.
Revision date: 02/2008
Release all pressure from the system before attempting to install, service, relocate or
performs any maintenance.
16. Keep all nuts, bolts and screws tight and ensure equipment is in safe working condition.
17. Do not put hands near or under moving parts.
18. Air Hose
It is not recommended to install a quick coupler between the hammer and leader (whip) hose.
Using fittings or air hoses which are too small can create a pressure drop and reduce the
power of the tool. For most of the hammers, using 9.525 mm (3/8") I.D. fittings with 6.35 mm
(I/4") NPT threads are recommended. For the others hammer, using 12.7 mm( 1/2") I.D. with
9.525 mm(3/8") NPT threads are recommended. Most compressors are shipped with a short,
6.35 mm ( 1/4") I.D. hose. For proper performance and more convenience, use a 9.525 mm
(3/8") I.D. hose. Hoses longer than 15.24 m (50 feet) should have a 12.7 mm (I/2") I.D.
Never carry a tool by the hose or pull the hose to move the tool or a compressor.
Keep hoses away from heat, oil and sharp edges. Replace any hose that is
damaged, weak or worn.
19. Storage
The scaling hammer must be lubricated before storing. Follow the air cylinder lubrication
instructions with an exception to step 4. Only run the scaling hammer for 2 to 3 seconds
instead of 20 to 30 seconds because more oil needs to remain in the scaling hammer when
storing.
2
Revision date 10/2015
2. Particular Safety Instruction
1. Information of Noise Level
(1)The noise level at the operator's position is about:
Model No.:
A-weighted sound
pressure level (Lpf)
A-weighted sound
power level (Lw)
Uncertainty K
wA
CH-PRO 25
96.4(dB)
106.6(dB)
3(dB)
CH-PRO 33
93.5(dB)
103.7(dB)
3(dB)
(2)Reference standard :ISO 15744.
(3)Always wear ear protectors during operation.
2. Information of Vibration Level
Model No.:
Vibration Level
(m/s2)
Uncertainty K
(m/s2)
CH-PRO 25
8.9
0.17
CH-PRO 33
14.7
0.44
(2)Reference standard: EN 28927-10.
3. Warnings
(1)The power tools are not generally insulated for coming into contact with electric power sources.
(2)The power tools shall not be used in explosive atmospheres unless specially designed for that purpose.
(3) Special precautions shall be taken when working in explosive atmospheres.
(4) Working with a percussive tool can generate dust which, depending on the material being worked on,
could be harmful to the operator.
(5)The inserted tool on heavy types of percussive non-rotary power tools, e.g. breakers, is exposed to
heavy strains and can after a long period of use break due to fatigue.
(6) The unexpected tool movement or breakage of inserted tool may cause injuries to the lower limbs, in
particular the feet.
(7) The unsuitable postures may not allow counteracting of normal or unexpected movement of the power
tool. A working position shall be adopted which remains stable in the event of a break up of the inserted
tool.
(8) Holding the inserted tool by the free hand can be a source of vibration damage.
(9) The power tools shall be isolated from the energy source before changing the inserted tool.
(10) Pay attention to the risk of a whipping compressed air hose.
(11) Rest after continuous operation.
3.
Revision date 10/2015
4. Instructions
(1) On suitable postures to counteract the effects of a sudden break of the inserted tool.
(2) Release the start and stop device in the case of an interruption of the energy supply.
(3) Only lubricants recommended by the manufacturer shall be used.
5. Explanations Of Warning Signs Used For This Tool
The operator’s
instruction must
be read before
work starts
Hearing
protection must
be worn
Eye protection
must be used or
safety glasses
worn
6. Application
Power tool driving a rotating spindle on which a bonded abrasive product is mounted.
7. The weight of this tools:
Model No.:
CH-PRO 25
CH-PRO 33
Weight
2.6 kg
2.5 kg
Note：If the weight of this tool exceeds 15 Kgs, the following attention shall be paid to：
(1) Be sure that you can afford the weight.
(2) Be sure to wear foot protection, to prevent the risk of impact due to the drop of tool.
4.
Revision date 10/2015
3.Maintenance Instruction
1. Lubrication
Proper lubrication is the owner's responsibility. Failure to lubricate the air tool. Properly will
dramatically shorten the lire of the tool and will void the warranty.
This scaler requires lubrication before the initial use and before and
after each additional use.
2. Scaler requires lubrication throughout the life of the tool and must be lubricated in two separate
areas：the air motor and the scaling mechanism. Follow the outlined procedures.
3. Air Motor Lubrication
The motor must be lubricated daily. An air motor cannot be oiled too often.
Disconnect the hammer from the air supply before lubricating.
1. Disconnect the scaler from the air supply.
2. Turn the hammer upside down.
3. Simultaneously (at the same time), pull the trigger and pour a teaspoon of oil in the air inlet.
Then, push the forward and reverse button in both directions.
After an air tool has been lubricated, oil will discharge through the exhaust port during the
first few seconds of operation. Thus, the exhaust port must be covered with a towel before
applying air pressure. Failure to cover the exhaust port can result in serious injury.
4. Connect the hammer to the air supply and cover the exhaust port with a towel.
Run the scaler, and oil will discharge from the exhaust port when air pressure is applied.
5. Scaling mechanism lubrication
The scaler should be lubricated monthly.
5.
Revision date: 02/2008
General Troubleshooting Guide
Symptom Possible Cause(s) Corrective Action
Tool runs slowly or
will not operate
1.Grit or gum in tool.
2.No oil in tool.
3.Low air pressure.
4.Air hose leaks.
5.Pressure drops.
1.Flush the tool with air tool oil, gum solvent, or
an equal mixture of SAE # 10 motor 011 and
kerosene. Lubricate the tool after cleaning.
2.Lubricate the tool according to the lubrication
instructions in this manual.
3.Adjust the compressor regulator to tool maximum
while the tool is running free.
4.Tighten and seal hose fittings if leaks are found.
5-1.Be sure the hose is the proper size.
Long hoses or tools using large volumes of air
may require a hose with an I.D. of 12.7 mm
(1/2") or larger depending on the total length of
the hose.
5-2.Do not use a multiple number of hoses
connected together with quick connect fittings.
This causes additional pressure drops and
reduces the tool power. Directly connect the
hoses together.
Moisture blowing
out of tool
1.Water in tank.
2.Water in the air
lines/hoses.
1.Drain tank. (See air compressor manual).
Oil tool and run until no water is evident.
Oil tool again and run 1-2 seconds.
2-1.Install a water separator/filter.
Note：Separators only work properly when the
air passing through the separator is cool.
Locate the separator/filter as far as possible
from the compressor.
2-2.Install an air dryer.
6.
Revision date: 02/2008
UNITOR CH-PRO 25
SPECIFICATIONS：
＊BLOW PER MINUTE --------------- 3000 ＊PISTON SIZE --------------- 23.5×20×73
＊AIR CONS. ------------------------ 12 CFM ＊WIGHT ------------------------------ 1.9 KG
＊AIR PRESSURE ------------------- 90 PSI
＊HOSE SIZE ------------------------- 3/8” ID
＊AIR INLET ------------------ 1/4” PT(NPT)
REF
NO.
PARTS
NO.
DESCRIPTION Q‘TY REF
NO.
PARTS
NO.
DESCRIPTION Q‘TY
1
752359
VALVE CAP 1 12
752369
“O” RING (d25.7×W3.5) 1
2
752360
“O” RING (d9.8×W1.9) 1 13
752370
HOUSING 1
3
752361
VALVE SPRING 1 14
752371
CLAMP RING 1
4
752362
VALVE STEM 1 15
752372
RUBBER HANDLE GRIP 1
5
752363
“O” RING (d4.8×W1.9) 1 16B
752373
CHISEL HOLDER 1
5-1
752364
“O” RING (d2.5×W1.5) 1 17
752374
STEEL BALL (7/16”) 1
6
752365
VALVE BODY 1 18
752375
“O” RING (d23.7×W3.5) 4
7
752366
THROTTLE LEVER 1 19
752376
BALL RETAINER 1
8
752367
SPRING PIN (Ø3×24L) 1 20
752377
SNAP RING (S-30) 1
9 722629 PISTON 1 21 728782 CHISEL (SET OF 3) 1
10 752368 CYLINDER 1 22
752378
HEX SOCKET BOLT (M8×20L) 1
11 722637 “O’ RING (d25.7×W3.5) 1 23
752379
SPRING WASHER (M8) 1
400 722132
To get maximum performance and life of your tool, replace the whole set of parts included in the Spare part kits:
Throttle valve overhaul kit 722603
Ball retainer overhaul kit 722611
UNITOR CH-PRO 33 STRAIGHT
SPECIFICATIONS：
＊ BLOW PER MINUTE ----------- 4600 BPM ＊PISTON SIZE ---------------- 25.4×43.5 MM
＊ WEIGHT -------------------------------- 2.8 KG ＊AIR PRESSURE ----------------------- 90 PSI
＊ HOSE SIZE ---------------------------- 3/8” ID ＊AIR INLET ---------------------- 1/4” PT(NPT)
REF
NO.
PARTS NO. DESCRIPTION Q‘TY REF
NO.
PARTS NO. DESCRIPTION Q‘TY
1
752449
BACK HEAD 1 31
752719
VALVE 1
2
752450
“O” RING (d3.8×W1.9) 1 32
752720
FRONT VALVE BLOCK 1
3
752451
THROTTLE VALVE 1 33 722439 PISTON 1
3-1
752452
“O” RING (d3.3×W1.5) 1 35
752721
BARREL SLEEVE 1
4
752453
SPRING 1 36
752722
NOSE 1
5
752710
“O” RING (d8.5×W2.4) 1 37
752723
KEY 1
6
752711
VALVE CAP 1 38
752724
DRIVER RETAINER 1
7
752712
LEVER 1 39
752725
RETAINER BUFFER 1
8
752713
SPRING PIN (Ø5×22.5L) 1 40 722447 BARREL ASS’Y (INCL. 35,36,37) 1SET
9
752714
HOSE ADAPTER 1 41 752726 RETAINER CLIP 1
10
752715
LOCKING RING 1 50 728790 CHISEL (3 PCS SET) 1
28
752716
ALIGNMENT SHIM 2 **K01 722405 THROTTLE VALVE OVERHAUL 1SET
29
752717
REAR VALVE BLOCK 1 KIT：(2,3,3-1,4,5,6)
30
752718
SPRING PIN (Ø3×14L) 1 **K02 722413 VALVE OVERHAUL KIT：(28, 29, 1SET
30,31,32)
400 722140
To get maximum performance and life of your tool, replace the whole set of parts included in the Spare part kits
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Revision date: 02/2008
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