Page 1
1873
3/8" COMPOSITE IMPACT WRENCH
www.astrotools.com
1 YEAR LIMITED WARRANTY
•Astro Pneumatic Tool Co. warrants our products to the original user against
defective material or workmanship for a period of 1 year (except where noted on our
price schedule) from the date of 1st use. Astro reserves the right to determine
whether the product failed because of defective material, workmanship or other
causes and to charge back for missing parts. Astro Pneumatic Tool Co., at its
discretion, will repair products covered under this warranty free of charge. The
distributor should direct the original user to return the product (with the exceptions
listed below) with the distributor’s name, address, adequate proof of date of
purchase or a copy of warranty card, and a short note explaining the problem.
Failures caused by accident, alteration, or misuse are not covered by this
warranty.
•Astro Pneumatic Tool Co. or its authorized service representatives must perform all
warranty repairs. Any repair to the product by unauthorized service representatives
voids this warranty. The rights under this warranty are limited to the original user and
may not be transferred to subsequent owners.
•This warranty is in lieu of all other warranties, expressed or implied, including
warranties of merchantability and fitness for a particular purpose. Some states do
not allow the exclusion of limitations of incidental or consequential damages so the
above limitations may not apply to you.
PLEASE DO NOT RETURN ANY PRODUCT WITHOUT CALLING
1-800-221-9705 FOR INSTRUCTIONS
Unpacking
When unpacking, check the parts diagram and part number
listing on page 4 to make sure all parts are included. If any
parts are missing or damaged, please call your distributor.
Product Information
• Very powerful, designed to be very light weight, nicely balanced and
very compact
• 3/8" impact wrench delivers one of the best power-to-weight rations
in its class
• Composite housing is extremely comfortable, very durable but is
one of the lightest impact wrenches available
• Aluminum hammer case is reinforced with high tensile strength steel
• Special treated powder metal cylinder gives extra long service life
• Bias motor design provides maximum torque output in reverse
• Handle exhaust directs air away from the operator and work area
• Teasing trigger provides smooth variable speed control
• The power management indexing knob on the rear of the impact
offers six power settings, three work in the forward positions and
three work in the reverse direction
SPECIFICATIONS:
Working Torque Range: 90-260 ft. /lbs. (120-351Nm)
Max. Torque: 300 ft. /lbs. (400Nm) in reverse
Blows Per Minuet: 1,400
Free Speed: 12,500 rpm
Recommended Air Pressure: 90psi
Air Inlet: 1/4" NPT
Air Hose I.D. Size: 3/8" (10mm)
Overall Length: 6" (154mm)
Weight: 2.81 lbs. (1.28kg.)
Sound Pressure: 95 dBA
Important
3/8" COMPOSITE IMPACT WRENCH
MADE IN TAIWAN
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1873 1873
1.) LUBRICATION:
Before connection of the hose, apply 4 to 5 drops of a good
quality air tool oil at the air inlet. After 3 to 4 hours of
operation, oiling may be necessary again.
2.) TIGHTNESS OF PARTS:
Regularly check whether all connection parts are
fastened securely. Follow this procedure daily
before beginning work.
3.) STORAGE:
Avoid storing the tool in a location subject to high humidity. If
the tool is left unused, the residual moisture inside the tool
can cause rust. Before storing and after operation, oil the tool
at the air inlet with a good quality air tool oil and run it for a
short period.
4.) DISPOSAL:
Follow national legislation of waste disposal.
3/8" COMPOSITE IMPACT WRENCH 3/8" COMPOSITE IMPACT WRENCH
5.) ORDERING SERVICE PART
For further operational and handling information or for
replacement of parts and components, contact the sales
agent from where you purchased the tool, or the service
division of our company, phone number 800-221-9705.
*When ordering parts and components, give each part
number, name, and quantities.
3/8" COMPOSITE IMPACT WRENCH
Page 2 Page 3
Page 3
Product Information
• Very powerful, designed to be very light weight, nicely balanced and
very compact
• 3/8" impact wrench delivers one of the best power-to-weight rations
in its class
• Composite housing is extremely comfortable, very durable but is one of
the lightest impact wrenches available
• Aluminum hammer case is reinforced with high tensile strength steel
• Special treated powder metal cylinder gives extra long service life
• Bias motor design provides maximum torque output in reverse
• Handle exhaust directs air away from the operator and work area
• Teasing trigger provides smooth variable speed control
• The power management indexing knob on the rear of the impact
offers six power settings, three work in the forward positions and
three work in the reverse direction
SPECIFICATIONS:
Working Torque Range: 90-260 ft. /lbs. (120-351Nm)
Max. Torque: 300 ft. /lbs. (400Nm) in reverse
Blows Per Minuet: 1,400
Free Speed: 12,500 rpm
Recommended Air Pressure: 90psi
Air Inlet: 1/4" NPT
Air Hose I.D. Size: 3/8" (10mm)
Overall Length: 6" (154mm)
Weight: 2.81 lbs. (1.28kg.)
Sound Pressure: 95 dBA
The oil and water extractor should not be mounted on or near the air
compressor.
The temperature of air is greatly increased during compression. As the air
cools down to room temperature, in the air line, on its way to the Air Power
Tool, the moisture contained in it condenses. Thus, for maximum
effectiveness, the oil and water extractor should be mounted at some point
SUGGESTED AIR LINE CONNECTION
Pitch pipe back toward air receiver
PIPE SIZE, I.D. (Inches)
Drain
Daily
Compressor unit
Air Flow
CFM
10
20
30
40
50
70
Oil and Water Extractor should be at least 25 ft. from the compressor. Further if possible.
Length of Pipe (feet)
50
1/2"
3/4"
3/4"
1"
1"
1"
in the air supply system where the temperature of the compressed air in the
line is likely to be lowest. Air lines must be properly drained daily. Each low
point in an air line acts as a water trap. Such points should be fitted with an
easily accessible drain. See diagram below. Pitch all air lines back towards
the compressor so that condensed moisture will flow back into the air
receiver where it can be drained off. Drain daily.
Install drain at
100
3/4"
3/4"
3/4"
1"
1"
1"
150
3/4"
3/4"
1"
1"
1"
1-1/4"
3/4"
1-1/4"
200
1"
1"
1"
each low point
Drain
Daily
Oil and Water
Extractor
Drain
Daily
25 FEET OR MORE
Page 4
372 Old US Highway 52 South
Mount Airy, NC 27030
3/8" COMPOSITE
1873
IMPACT WRENCH
Call 1.800.221.9705 for questions concerning performance of the product
or other inquiries.
Index
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1873-01
1873-02
1873-03
1873-04
1873-05
1873-06
1873-07
1873-08
1873-09
1873-10
1873-11
1873-12
1873-13
1873-14
1873-15
1873-16
1873-17
1873-18
1873-19
1873-20
1873-21
1873-22
1873-23
Air Inlet
Dowel Pin
O-Ring
O-Ring
Deflector
Spring
Valve Stem
Valve Seat
Washer
Retainer Ring
Spring Pin
Spring Pin
O-Ring
Trigger
Power Management Knob
Spring
Steel Ball
Bolt
End Cover
Gasket
O-Ring
O-Ring
Valve Body
Index
No.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
1
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
1873-24
1873-25
1873-26
1873-27
1873-28
1873-29
1873-30
1873-31
1873-32
1873-33
1873-34
1873-35
1873-36
1873-37
1873-38
1873-39
1873-40
1873-41
1873-42
1873-43
1873-44
1873-45
1873-46
Lock Washer
Screw
O-Ring
Connecting Pipe
Composite Motor Housing
Ball Bearing
End Plate
Guide Pin
Blade
Rotor
Cylinder
Front Plate
Ball Bearing
Gasket
Hammer
Hammer Cage
Hammer Pin
Anvil
O-Ring
Socket Retainer
Bushing
Hammer Case
Spring Pin
1
1
2
1
1
1
1
1
6
1
1
1
1
1
2
1
2
1
2
1
1
1
1
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