Servicing the 2955 Series Impact Wrench

Use this guide when diagnosing, servicing, or repairing the Ingersoll Rand® 2955B2 Impact Wrench.

This article is intended for Ingersoll Rand distributors, authorized service centers, and qualified service personnel. For customer-level maintenance and troubleshooting, see Maintaining Your 2955 Series Impact Wrench and Troubleshooting Your 2955 Series Impact Wrench.

Before You Begin

Before servicing the tool:

1. Turn off the air supply.
2. Bleed the air pressure.
3. Disconnect the air supply hose.
4. Remove the socket.
5. Clean excessive dirt and debris from the exterior of the tool.
6. Obtain the current 2955 Series Diagnostic and Service Instructions, 2955B2 Series Parts Information, and 2955B2 Series Maintenance Information.
7. Evaluate and document the reported problem before beginning disassembly.

Use the current Parts Information to identify replacement components and the Diagnostic and Service Instructions for detailed disassembly and reassembly procedures.

Diagnose Before Disassembly

Whenever possible, confirm the customer's reported symptom before opening the tool.

Determine whether the problem involves:

• Low power or low torque output
• Motor will not run
• Motor runs but the tool will not impact
• Unusual noise
• Excessive vibration
• Air leakage
• Trigger or regulator operation
• Square drive or socket-retaining components

Note whether the problem occurs continuously or intermittently and whether it changes under load.

Verify the Air Supply

Before diagnosing an internal tool problem:

1. Connect the tool to an appropriate air supply.
2. Run the tool at full speed without load.
3. Measure dynamic air pressure at the tool inlet while the tool is running.
4. Verify 90 psi at the tool inlet.
5. Confirm that the air system can provide the required 138 CFM.
6. Verify that a minimum 3/4-inch air hose is being used.
7. Check hoses, fittings, filters, regulators, and other air-system components for restrictions or leaks.

Correct air-supply problems before proceeding with internal diagnosis.

Check Tool Performance

After verifying the air supply, evaluate tool operation.

Listen and feel for:

• Excessive or unusual noise
• Abnormal vibration
• Irregular motor operation
• Abnormal impact-mechanism operation

When appropriate, measure torque output using a Skidmore or equivalent torque-testing device and compare the result with the published working torque range for the tool.

The 2955B2 has a recommended torque range of 1,600–3,750 ft-lb (2,170–5,100 Nm).

If performance is within the published range, additional internal repair may not be necessary.

Check Lubrication

Before disassembling the motor or impact mechanism, verify that the tool has been properly lubricated.

Air Motor

The air motor requires IR #10 Air Tool Oil.

If an inline lubricator is not being used, the tool requires 8–12 drops through the air inlet before each use.

Inspect the motor for evidence of inadequate lubrication, contamination, corrosion, or excessive wear when service is required.

Impact Mechanism

The impact mechanism requires 4 cc of Ultra-Performance Royal Purple Grease with Synslide after every 48 hours of actual trigger runtime.

If impact performance is poor or the impact mechanism is noisy, verify lubrication before assuming that components require replacement.

Low Power or Low Torque

If the tool operates but produces insufficient power or torque, first rule out external causes.

Check for:

• Insufficient dynamic air pressure
• Insufficient airflow
• Undersized or restricted hose
• Dirty or restricted inlet components
• Restricted exhaust components
• Inadequate air-motor lubrication
• Contamination within the motor

If these conditions are not responsible for the problem, inspect the motor.

Potential internal causes include:

• Worn or broken vanes
• Worn or damaged cylinder
• Scored end plates
• Dirty motor components
• Damaged bearings or other motor components
• Incorrect assembly

Replace worn or damaged components using the current Parts Information.

Motor Will Not Run or Blows Air

If air passes through the tool but the motor does not operate correctly, inspect the motor assembly.

Possible causes include damaged, incorrectly installed, or improperly assembled:

• Rotor
• Bearings
• Vanes
• Cylinder
• End plates
• Spacers
• Other motor components

Disassemble the motor according to the 2955 Series Diagnostic and Service Instructions and inspect the components.

Replace worn or damaged parts before reassembly.

Tool Will Not Impact

If the motor operates but the tool does not impact:

1. Verify that impact-mechanism lubrication is current.
2. Remove the hammer case according to the service instructions.
3. Inspect the impact mechanism for worn, damaged, or broken components.
4. Verify that the impact mechanism was assembled correctly.
5. Replace damaged or excessively worn components.
6. Lubricate the impact mechanism during reassembly.

Do not return the tool to service until the impact mechanism operates normally.

Inspect the Motor Components

When motor disassembly is required, inspect components for:

• Wear
• Scoring
• Cracks or breakage
• Contamination
• Corrosion
• Evidence of inadequate lubrication
• Incorrect assembly

Clean serviceable motor components using an appropriate cleaning solution in a well-ventilated area.

Replace worn or damaged components using the correct Ingersoll Rand service parts.

Refer to the 2955 Series Diagnostic and Service Instructions for the complete motor disassembly and reassembly procedure.

Inspect the Impact Mechanism

When servicing the impact mechanism, inspect:

• Hammers
• Hammer frame
• Hammer pins
• Anvil
• Bearings and related components
• Hammer case
• Other impact components identified in the Parts Information

Look for excessive wear, cracks, deformation, scoring, or other damage.

Replace damaged or excessively worn components.

Apply the specified Ultra-Performance Royal Purple Grease with Synslide during reassembly according to the service and maintenance instructions.

Inspect the Square Drive and Socket Retainer

Inspect the 1½-inch square drive and socket-retaining components for:

• Cracks
• Deformation
• Excessive wear
• Damaged retaining components
• Other conditions that could prevent secure socket retention

Replace damaged components before returning the tool to service.

Inspect the Trigger, Regulator, and Air-Inlet Components

If the tool has an air leak, inconsistent operation, or control problem, inspect the applicable inlet and control components.

Check for:

• Dirt or contamination
• Restrictions
• Damaged seals
• Worn valve components
• Damaged springs
• Components that bind or do not move freely
• Incorrect assembly

Clean or replace components as required using the current Parts Information.

Disassembly and Reassembly

Ingersoll Rand provides dedicated service procedures for disassembling and reassembling the 2955 Series.

Use the 2955 Series Diagnostic and Service Instructions for the complete procedure.

The videos below should be used with the current service documentation rather than as a substitute for required safety, parts, lubrication, and service information.

During service:

• Disassemble only as far as necessary to correct the identified problem.
• Inspect components as they are removed.
• Replace worn or damaged components.
• Use the current Parts Information to verify part numbers.
• Clean reusable components as appropriate.
• Use the specified lubricants during reassembly.
• Verify that components are correctly positioned and assembled before testing the tool.

Lubricate During Reassembly

Use the specified lubricant for each area of the tool.

For routine impact-mechanism maintenance, apply 4 cc of Ultra-Performance Royal Purple Grease with Synslide every 48 hours of actual trigger runtime.

Follow the Diagnostic and Service Instructions when lubrication is part of internal service or reassembly.

Post-Service Testing

After reassembly:

1. Verify that all components and fasteners are correctly installed.
2. Check the square drive and socket-retaining components.
3. Verify trigger and regulator operation.
4. Connect the tool to a properly regulated air supply.
5. Run the tool without load.
6. Check for air leaks.
7. Listen for unusual noise.
8. Check for excessive vibration or irregular operation.
9. Measure dynamic air pressure at the tool.
10. When appropriate, measure torque output on a Skidmore or equivalent and compare the result with the published working range.
11. Confirm that the original reported problem has been corrected.

Do not return the tool to service if abnormal operation remains.

Warranty Considerations

When evaluating a tool for warranty repair, document the condition and cause of failure.

IR's pneumatic impact diagnostic guidance distinguishes between conditions that may be warrantable and problems associated with contamination, insufficient lubrication, abuse, or previous improper repair.

Follow current Ingersoll Rand warranty procedures when determining coverage.

Service centers and distributors with access to the applicable warranty-management system should use the current IR process for warranty claims and required part returns.

When Additional Support Is Needed

Contact Ingersoll Rand Technical Support if:

• The cause of the failure cannot be determined.
• The required repair is not covered by the available service documentation.
• You cannot identify the correct replacement part.
• The tool continues to perform outside its published range after repair.
• Additional warranty or repair guidance is required.

Use Submit a Request through IRToolHelp for technical or warranty assistance.

Manuals & Downloads

Use the current versions of the following resources for complete product, maintenance, parts, safety, and service information:

• 2955B2 Series Product Information
• 2955B2 Series Parts Information
• 2955B2 Series Maintenance Information
• 2955 Series Diagnostic and Service Instructions