Overhauled and serviced Koken KW3800proGL 1 inch, 25.4mm

Bolt Diameter: 38mm / Practical Torque Range: 300-1,370 N?m / Body Weight: 7.8 Kg
Overall Length: Approx. 516mm
KW3800proGL
Usage frequency and age of the air impact wrench housing are unknown.
There are scratches, paint peeling, dirt, rust, and damage to resin parts due to on-site use.
As shown in the images, there are many scratches that have not led to internal damage.
Disassembly, cleaning of each part, inspection and replacement of parts, and performance testing by skilled technicians.
〇 Shank (socket connection part, square drive) visually and tactilely inspected.
Anvil replaced as appropriate to optimize socket fit, engagement, and torque transmission.
Please refer to the enlarged image of the shank.
〇 Internal inspection of the housing, replacing all worn or deteriorated parts (including new parts).
After reassembly, final confirmation of the following items using a dedicated performance tester:
Torque, rotation speed, airtightness, impact stability, reverse function.
We have confirmed torque measurement values exceeding those of new products, so please do not exceed the appropriate air pressure of 0.6 MPa.
[Important ①]
The torque of an air impact wrench is greatly influenced by the air supply volume.
Insufficient air pressure, thin or long hoses, or resistance from quick couplers can often lead to the feeling that torque is not being produced. In some cases, only 50-70% of the maximum torque may be produced due to air supply issues.
To ensure proper tool inlet pressure, we recommend using a hose with an inner diameter of 3/8 inch or larger and a high-flow quick coupler.
[Important ②]
Each impact wrench model has a maximum output torque.
〇 For medium-duty truck wheel nuts
19-25.4mm / 250-1,370 N?m
Work with a model appropriate for the vehicle type, and immediately release the trigger once the nut is loosened. Do not run it empty.
Attaching a large diameter socket to a low-capacity model and attempting to forcibly loosen a seized nut that exceeds the tool's capacity will place a significant load on the internal hammer mechanism and dogs, leading to premature breakage and malfunction.
If the nut is severely seized, be sure to apply plenty of penetrating lubricant, let it sit for 10-30 minutes or more, and then gradually loosen it by repeating short bursts of impact (a few seconds each, strictly no more than 30 seconds continuously). Alternatively, use heat or alternative tools (such as breaker bars or shock drivers).

We have taken every precaution, but please judge based on the images.
Images of the same model are reused, and the background and stands shown in the images are not included with the product.
The product will be shipped using used packaging materials.