Alfa Laval Rotary Lobe Displacement Pump GHPD-532P

– The packing rings are located within the gland housing and are tightened onto the shaft sleeve by adjusting the gland follower. On flushed packed glands a lantern ring replaces the middle ring of packing. The shaft sleeve is retained to the shaft by three socket set screws and is sealed by an 'O' ring.

1. Release and pull back the gland follower.

2. Remove the rotorcase with gland housing, packing and gland follower still assembled.

3. Loosen the shaft sleeve socket set screws and extract the sleeve from the shaft.

4. Inspect and replace the packing and shaft sleeve if necessary.

1. Lubricate the 'O'ring, locate in shaft sleeve and slide onto the shaft.

2. Tighten up the socket set screws.

– 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.

CAUTION! SEAL FACES ARE BRITTLE - TAKE EXTREME CARE WHEN HANDLING.

1. Carefully support and remove the rotorcase with the stationary sealing face still within its bore.

2. Slide the remaining rotary face from the shaft.

3. Release the retaining clip and remove the stationary face for inspection.

1. Use solvent to wipe the lapped surface of the seal faces until PERFECTLY clean, being extremely careful not to scratch the faces.

1. The pump will NOT be supplied oil filled.

2. First change - After 150 hours of operation.

3. Only use the oil/grease types recommended by your supplier.

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

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.

– The large 'O' ring sits within the rotorcase bore and runs on the shaft sleeve. Rotation for the shaft sleeve is provided by a spring which locates in a slot on the shaft. An 'O' ring seals the shaft sleeve to the shaft.

2. Slide the shaft sleeve from the shaft and inspect the 'O' rings.

1. Lightly lubricate the 'O' rings with greas (food quality if necessary), locate in the shat sleeve and rotorcase bore.

2. Slide the shaft sleeve onto the shaft an locate the pin into the slot on the shaft.;