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Filter
The Snap-on AHR424 Filter, or equivalent, should be
used to assure clean air for the tool. Water, dirt and scale
act as abrasives which could damage the air tool. A filter
unit should be installed between the compressor and the
air regulator and air lubricator.
Air Regulator
Regulated air pressure is necessary for proper
performance of the air impact wrench. The Snap-on
AHR426 Regulator, or equivalent will adjust and maintain
the recommended air pressure of 90 psig (6.2 bar, 620
kPa). Pressure less than this reduces efficiency, while
pressure greater than this increases blows and speed
beyond the rated capacity—creating potential hazards
and possible damage to the air impact wrench. Check the
air pressure at the regulator while using the impact
wrench in a normal manner.
Air Line Lubricator
• Do not use a heavy grade of oil because stalling and low
performance will result.
The preferred method of lubricating the air impact
wrench motor is to use an air line lubricator such as the
Snap-on AHR428 Lubricator. It should be filled with
Snap-on IM6 Air Motor Oil or a good grade of SAE 10W
oil.
If an air line lubricator is not used, lubricate the air motor
by injecting approximately 1/8 oz (3.75 ml) of IM6 Air
Motor Oil into the air inlet of the wrench each day before
using it. IM6 Oil is specially formulated for air tools and
no flushing solvent is needed.
Oil Reservoir
The impact mechanism chamber is sealed at the factory
and should not require any additional oil.
Impact Power/Frequency
Regulator
Torque output is governed by the air line pressure, the
regulator setting and the time spent working. An air line
pressure of 90 psig (6.2 bar, 620 kPa) is recommended.
This regulator is located on the back of the wrench and
regulates the power and frequency of the impact blows in
forward direction only. It has three settings (low,
medium, high) as indicated on back of tool.
Forward / Reverse Lever
The forward/reverse switch determines the rotating
direction
of
the
counterclockwise. The forward/reverse lever is located in
the middle of the wrench above the trigger.
ZPT338CE Rev. C
anvil,
either
clockwise
Service Instructions
• Refer to Figure 2 for parts listing. Use only genuine
Snap-on replacement parts for maintenance and
repair. Servicing and repairs should be performed only
by trained personnel. Repair parts and service manual
available
through
representative.
or
5
your
authorized
Snap-on
(01/21)
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