Impact Wrench Lubrication Procedure for High‑Cycle Applications

Using an appropriate hand tool or driver with a T-15 Torx bit, remove the four back cap screws.

• Maintain firm engagement between the tool bit and the screw head to prevent slipping or damage
• If a screw is difficult to remove, a powered driver may be used with care
• Any damaged screws must be replaced before reassembly
• Final torque for reinstallation: 1.3–1.6 Nm

Reposition the tool so the back cap opening is facing downward and resting flat on the work surface, with the anvil pointing straight up.

Caution: Maintain control of the metal housing during this step to prevent internal components from shifting or falling out.

Press down with your index finger on the anvil to secure the internal components and pull upward on the hammer case to remove it from the housing.

The hammer mechanism and anvil shaft are now accessible for lubrication.

Clean and inspect for wear and damage:

• Hammer Case
• Anvil
• Impact Mechanism
• Gearing 
• Motor Spline 

Apply IR #67 grease to the gearing:

• 2 pumps to each side of all 3 planet gear pockets.
• Light coating to the ring gear.
• Light coating to the to the thrust washer.

Reinstall Mechanism to Ring Gear.

Apply IR #105 grease to the Impact Mechanism:

• 3 pumps to each Camshaft pocket.
• 1 pump to each of the 4 Hammer Jaw impact surfaces.
• 1/2 pump to each side of the Camshaft Pilot Diameter, Camshaft Pilot Step and the top of the Camshaft Pilot.
• Reinstall Anvil to Mechanism.
• 1 pump across the top surface of the Hammer Jaws and Anvil.

Apply IR #105 Grease to the bushing surface of the anvil shaft.

• Apply two controlled squeezes of grease
• Spread the grease evenly over the entire bushing surface

Proper lubrication:
The anvil shaft bushing is fully coated with a thin, even layer of grease.

Insufficient lubrication:
The bushing surface appears dry or only partially coated.

Note: Do not apply excess grease. Over‑lubrication can cause sluggish operation and reduced performance.

Apply IR #105 Grease to the inside bushing surface of the hammer case.

• Apply two controlled squeezes of grease
• Spread the grease evenly into the bushing grooves

Proper lubrication:
The grooves inside the hammer case bushing are filled evenly with grease.

Insufficient lubrication:
The grooves appear dry or unevenly coated.

Before reassembly, visually inspect both lubricated areas:

• The anvil shaft bushing should be fully coated
• The hammer case bushing grooves should be evenly filled
• No excess grease should be present outside the bushing surfaces

This verification helps ensure proper performance and avoids grease migration into other areas of the tool.

Align the connector features on the hammer case with the corresponding features on the tool housing. Press the hammer case down until it is fully seated.

• Ensure the hammer case sits flush against the housing
• Do not force the hammer case into position; alignment should be smooth

Reposition the tool so the back cap opening is facing upward.

Caution: Maintain control of the metal housing during this step to prevent internal components from shifting.

Inspect all four back cap screws.

• Replace any damaged screws before reassembly
• Apply blue threadlocker to the threads of each screw
• Roll the screws to ensure even thread coverage

Install the four back cap screws and tighten them in a cross pattern to ensure even seating.

• Final tightening torque: 1.3–1.6 Nm

Wipe down the exterior of the tool using a clean, lint‑free cloth.

• Remove any residual grease from the anvil surface and hammer case
• No visible grease should remain on the exterior of the tool