Alfa Laval Rotary Lobe Displacement Pump GHPD-422P

Check the oil level in the gearcase (if applicable)

Check the mechanical seals for leakage and replace as necessary

Adjust the packed glands to control leakage

Check the oil seals for leakage

Sign off on the weekly pump maintenance

Select the condition of the air

Enter the date of the next grease change

Was the grease successfully pumped into the rear of the gearcase?

Sign off on the grease replacement

Warning: The pump will NOT be supplied oil filled.

Enter the current hours of operation

Has the pump been operated for 150 hours?

If yes, proceed to oil replacement. If no, stop the procedure.

Upload a photo of the oil level in the sight glass.

Sign off on the oil replacement

Firmly press on the o-rings (15) to the rear stationary faces (14) and locate them within the rear flush housing (16,17)

Carefully fit the rear seal housings (16,17) with the stationary face onto the shaft (22). (Caution: do not chip stationary face)

Push outboard rotary assembly (10,11) onto pump shaft (22) to the setting dimension (A) indicated on the assembly drawing and tighten set screws

Locate o-rings on the shaft (5, rotary) and within the rotorcase bore (1, stationary)

Press washer (7) underneath the inside drive pin into the rotary face (6) and gently slide onto the shaft, locating the pin in the shaft slot

Position the wave spring (3) over the stationary face (2), push into the rotorcase

Position front seal housing (9) onto rotorcase and hex head tighten screws (8). Be sure not to over tighten

Refit the rotorcase, using the shaft sleeve to ensure stationary seal is not chipped during assembly

Fit rear seal housings (16,17) and o-rings (12) to front flush housings (9) and tighten the hex nuts (18). (Caution: Be sure not to overtighten the hex nuts)

– 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.