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9T1000 Mud Pump Bearings Clearances Measurement - Bulletin

TECHNICAL BULLETIN

Dated 28 April, 2011

Equipment Involved: Triplex Mud Pump 9T1000 Subject: Allowable bearings clearances

Pinion shaft

Pinion shaft bearing clearance

Pos. Description Check done Clearance after installation Suggested limit to be observed

1 Pinion bearings Bearing races clearance 0,0 0 41” – 0, 0 0 8 5”0,0 1 7” 2 Housing bearing Clearance check 0,0000” – 0,0034” 0,004”

Backlash between pinion gear and bullgear

Pos. Description Check done Clearance after installation Suggested limit to be observed

A Pinion Visual check; backlash between pinion gear and bull gear 0,012” – 0,020” 0,035”

IMPORTANT Before proceeding with the clearances measurements, put the mud pump in safety conditions, avoiding any unpredictable rotation. Example: to wedge with a wooden wedge both the sides op the contact area between the pinion and the gear. Rotate the eccentric shaft till reaching the condition of connecting rod 1 in horizontal position (perpendicular to the applied force). Position the jack and the dial gauge as shown in the figure, paying attention to the note. Apply a maximum force of 1 ton. Repeat the same operation with the connecting rod 3.

The position of the dial gauge should be as vertical as possible. This position is only an example: The magnetic base shall be on the mud pump body, the sensor shall be put on the mobile part (pinion shaft).

Crankshaft

Crankshaft bearing clearance

Pos. Description Check done Clearance after installation Suggested limit to be observed

1 Main bearings Bearing races clearance 0,0010” – 0,0051” 0,012” 2 Connecting rod bearing Bearing races clearance 0,0003” – 0,0095” 0,018” 3 Crosshead pin bearing Bearing races clearance 0,0002” – 0,0073” 0,017” 4 Housing bearing Clearance check 0,0000” – 0,0040” 0,007”

Remove the carter on the transmission between the electri motor and the pump.

Transmission carter

Remove the cover “A” from both sides of the pump, by loosening the blocking screws. Check the bearings clearance with a thickness gauge, as shown in the following figure.

Bearing measurement mud pumps Clearance rollers - outer racing 10 min 2 o’clock