Air Compressor Specifications
| Lubrication | Each time a Series 3940, 3942 or 3955 Impactool is disassembled for maintenance and repair or replacement of parts, lubricate the tool as follows: Work approximately 12 to 15 cc of Ingersoll-Rand No. 170 Grease into the impact mechanism. Coat the Anvil (38) lightly with grease. Also, coat the inside of the Hammer Case Bushing (40) with grease. Inject approximately 2 to 4 cc of grease into the Grease Fitting (2). Use Ingersoll-Rand No. 10 Oil for lubricating the motor. Inject approximately 1 to 2 cc of oil into the Straight Inlet (10) before attaching the air hose. |
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Troubleshooting
8Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Low power | Dirty Inlet Bushing or Air Strainer Screen and/or Exhaust Silencer. | Using a clean, suitable, cleaning solution, in a well ventilated area, clean Air Strainer Screen, Inlet Bushing and Exhaust Silencer. |
| Worn or broken Vanes | Replace complete set of Vanes. | |
| Worn or broken Cylinder and/or scored End Plates | Examine Cylinder and replace it if it is worn or broken or if the bore is scored or wavy. Replace End Plates if they are scored. | |
| Dirty motor parts | Disassemble tool and clean all parts with a suitable cleaning solution, in a well ventilated area. Reassemble tool as instructed in this manual. | |
| Motor will not run | Incorrect assembly of the motor. | Disassemble the motor, replace worn or broken parts and reassemble as instructed. |
| Insufficient lubricant in the impact mechanism | Remove Hammer Case Assembly and lubricate impact mechanism. | |
| Tool will not impact | Broken or worn impact mechanism parts. | Remove Hammer Case and examine the impact mechanism parts. Replace any worn or broken parts. |
| Impact Mechanism not assembled correctly | Refer to Assembly of the Impact Mechanism. |
Fault codes and symptom→remedy steps extracted from this unit’s service/owner documentation; verify against the official manual before servicing.
Available documents
Service manual
About
Ingersoll Rand Series 3955 — air compressor. Specifications and parts compiled from manufacturer documents.