Service How To Procedures Bijur - Mechanical - Oil Pump - Service and Test - AD0063
Last updated: 12/03/2018

Bijur - Mechanical - Oil Pump - Service and Test

AD0063

Applies to machines built from: January, 1989 to January, 2015

Introduction

Perform this procedure after replacing the spindle or one of the following conditions exist:

  1. The oil pump does not operate.
  2. There is contamination at the bottom of the reservoir.
  1. Oil pump motor
  2. Plunger
  3. Oil pump gearbox and cam
  4. Lever arm
  5. Oil pump
  6. Oil ouput hose
  7. Oil filter
  8. Low oil level switch

Machine Compatibility

The Bijur mechanical oil pump was used on these machines.

  • Small and medium VMCs from 1989 to 2008.
  • Large VMCs from 1995 to 2014.
  • HMCs from 1994 to 2015.

Bijur - Mechanical - Oil Pump - Service

1

Support the oil reservoir.

Remove the screws that hold the reservoir to the pump assembly. Replace the reservoir gasket.

Clean the reservoir to remove the built-up contamination. Replace the tube from the oil pump and oil filter.

2

Remove the motor cover.

Cut off the closed-end connectors that fasten the power leads to the power cord. Discard the motor.

Cut the new motor leads to 2 inches. Strip the cable and new motor leads 0.5 inches from the ends.

Intertwine the wires from the new motor with the wires from the power cord as shown.

Crimp the wires and secure the cables together with a cable tie.

3

Replace these items from the oil pump in the order shown:

  1. The retaining wire.
  2. The retention ring.
  3. The felt filter.
  4. The fine screen.
  5. The coarse screen.

4

Use a 3/8" open end wrench [1] to loosen the pump head fitting [2].

Disconnect the oil line [3].

Use adjustable pliers to remove the check valve [4] for the pump-head.

5

Clean all of the contamination out of the ball and seat area [1]. Dry the check valve.

Shake the check valve. If you cannot hear the ball moving freely in the check valve, clean it again. Make sure the ball can move freely.

Install the check valve for the pump-head and the oil line that you removed in Step 1.

Install the remaining components in the reverse order that they were removed. Make sure they are dry.

6

Remove the canister filter cap [1]. Remove the o-ring [2].

Remove and discard the sintered Bronze filter [3] and associated o-ring [4]

Note: If you received a rebuild kit with these items DO NOT install them. 

Install the items in the reverse order that they were removed. Install the oil reservoir. Replace the reservoir gasket.

7

Fill the reservoir to the max fill line [1].

 Note: To prevent build up of contamination, use Mobil SHC 625, Mobil 1 5W-20, or Mobil 1 10W-30. Do not use Mobil Vactra #2.

When you use Vactra #2, contamination ("sludge") collects in the reservoir. This causes the pump assembly to become clogged.

You must fill the reservoir tank to the max fill line [1] each time you fill the tank. This makes sure the dip trough [2] is full of oil. This lubricates the drive and worm gears [3] of the pump.

Bijur - Mechanical - Oil Pump - Test

1

Lift the plunger to hand-prime the pump until the pressure reads approximately 20 psi (1.38 bar).

 Note: If the lever arm [1] pushes up on the plunger, you cannot hand-prime the pump. Operate the spindle up to 30 minutes for the next pump cycle to complete.

In MDI mode, command the spindle to run at low speed, for example, 5 RPM.

This turns on the oil pump motor.

Stop the spindle when the lever arm drops.

2

Disconnect the oil feed tube [1] from the fitting [3] above the canister filter.

Pull up on the plunger [2].

Oil comes out of the fitting [3] when the pump operates correctly.

Connect the oil feed tube.

If no oil comes out of the fitting, refer to Mechanical Bijur Lube Pump Troubleshooting Guide.

3

In MDI mode, command the spindle to run at a low speed, for example, 5 RPM.

 Note: The Bijur mechanical pump takes approximately 30 minutes to complete a cycle.

Look at the oil pressure gauge when the plunger drops.

The oil pressure gauge shows 20 to 40 psi (1.38 - 2.75 bar). The pressure gradually decreases to 0 psi (0.0 bar) in 3-10 minutes.

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