Alfa Laval Rotary Lobe Displacement Pump GHPD-522

1. Pump supplied grease filled.

2. Change - every two years (dusty air conditions)

* Change - every six years (clean air conditions)

3. Fill with grease by pumping grease into the rear of the gearcase.;

1. The pump will NOT be supplied oil filled.

2. First change - After 150 hours of operation.

3. Fill with oil through the filler plug to the level indicated in the sight glass.;

1. Checking the oil level in the gearcase (if applicable).

2. Checking the mechanical seals for leakage and replacing as necessary.

3. Adjusting the packed glands to control leakage.

4. Checking the oil seals for leakage.

– The seal rotary face is driven by a pin which locates in a slot on the shaft. A washer is located between the shaft shoulder and rotary face. A seal between the rotary face and shaft is provided by an 'O' ring.

– The stationary face is prevented from rotating as it has a flat side which sits in the rotorcase bore. Face to face contact is provided by a wave spring.

– Axial movement of the stationary face is prevented by a retaining clip. An 'O' ring within the rotorcase bore provides a seal onto the stationary face.

– A seal housing encloses the hyclean seal and is seal by an 'O' ring and retained to the rotorcase by socket head cap screws. A lip seal sits within the seal housing and runs on the rotary face, thus providing a seal.

CAUTION! SEAL FACES ARE BRITTLE - TAKE EXTREME CARE WHEN HANDLING. REMOVING THE FLUSHED HYCLEAN SEAL

REMOVING THE FLUSHED HYCLEAN SEAL

1. Carefully support and remove the rotorcase with the seal housing and stationary face still attached.

2. Slide the rotary face from the shaft.

3. Remove the seal housing screws to inspect the seal.

CAUTION! COMPLETE DISASSEMBLY IS ONLY REQUIRED IF THE 'O' RINGS OR SPRINGS ARE TO BE REPLACED.

- The relief valve should not be disassembled while the plug is in operation. Always observe the safety precautions detailed at the front of this manual.

- Take extreme care when removing the springs as they have been compressed.

2. Release and remove the notched nuts) with the spring adjuster.

3. Take off the springs, release the socket head cap screws and remove the valve guide.

4. Access to the pneumatic piston 'O' rings is achieved by releasing the circlip which locates in the valve shaft.

5. The hydraulic piston with the shaft may be lifted out of the front cover once the backstop disc is removed.