B3800 Air Compressor Pump Replacement, Complete Assembly, Single-Stage, 3 - 5 HP #05C179

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Price: $183.28

Description

Old Part Numbers: 4116091337

Complete B3800 replacement air compressor pump assembly includes flywheel, sight glass, oil breather, and air filter (no aftercooler). 3 - 5 HP.

Note: This pump has a LEFT-side discharge. If your discharge tube connects to the right side of the pump head you can simply remove the head bolts and lift the valve plate assembly and head as one piece and flip it 180° so that the discharge is on the right side of the head.

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Specifications

  • HP: 3 HP to 5 HP
  • Stages: Single-Stage
  • CFM Delivery: 7.41 CFM @ 100 psi with 5 HP motor
  • Max PSI: 130 PSI
  • Material of Construction: aluminum with steel sleeves
  • Flywheel: 13.78" OD single "A" groove
  • RPM: 700 Min / 1,450 Max
  • Oil Capacity: 1.12 qts.
  • Weight: 24 lbs.
  • Bore & Stroke: 2.36" x 1.97"
  • Dimensions (LxWxH): 13.0" x 11.38" x 13.56"
  • Bolt Pattern: 5.5" front-to-back, 6.19" side-to-side
  • Warranty: 1 year limited

Extras

For the B3800 & NS18S. Torque specs for Head Bolts = 18-20 ft/lbs. Torque specs for Aftercooler Bolts = 14 ft/lbs. Torque specs for Oilpan Bolts = 3.69 ft/lbs.

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2 Reviews

  • 5
    B 3800 Air Compressor pump

    Posted by Robert Blanke on Mar 26, 2025

    I ran my Harbor Freight compressor out of oil and threw a rod. The 3800 is the exact pump I needed and got me going a day after it arrived. No one in the country had the pumps except Master Tool Repair!

  • 4
    Seems to be working well

    Posted by David Scheer on Feb 15, 2024

    REplace a Harbor Freight compressor that froze up. FIrst order was backordered. Had to cancel and reorder later. It came quickly.

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