How to inspect, clean and replace the oil on your DZS Dry Claw vacuum pump

In this page we will go over how to inspect, clean and replace the oil on your Dry Claw vacuum pump. Regularly inspecting and maintaining your vacuum pump not only saves time and money in the long run but also keeps your system running smoothly. Take the time to care for your equipment, and it will serve you reliably for years to come.

This maintenance procedure applies to the: DZS 100 – 400 VSD+A, DZS 065 – 300 AP, and DZS 065 – 300 A vacuum pumps.

Before you begin any service, make sure that you keep safety in mind, and read over the instruction manual for this pump for safety recommendations. 

For this service you will need: 

1. Claw puller

2. Spanner

3. Allen key set 

4. Allen key t-handle

Special tools required for this service:

1. G10016044 – Claw blocking tool 65-100

2. G10016043 - Claw blocking tool 300

1. Start by remove the bolts on the front panel using a 5mm Allen key

2. Now remove the pressure sensor on the pump. [Note: the pressure sensor is not a part of all product variants].

3. Unscrew the bolts to remove the side cover with a 5mm Allen key.

4. Remove the side cover from the pump. 

1. Next, unscrew the oil filling cap and breather with a 13mm spanner.

2. Now with an 8mm Allen key remove the drain plug. 

3. Drain the oil from the pump. 

4. When the oil is drained from the pump, fit the drain plug back onto the pump, using an 8mm Allen key. 

1. Begin by remove the silencer drain plug with an 8mm Allen key T-handle. [Note: the pressure sensor is not part of all product variants]. 

2. Drain the condensate from the pump. 

3. Now fir the silencer drain plug with a new O-ring. Use an 8mm Allen key T-handle and 10Nm of torque. 

4. Remove the Pt1000 sensor with a 5mm Allen key. [Note: this temperature sensor (PT 1000) is not part of all product variants]. 

1. Unscrew the bolts to remove the front cover of the pump, using a 6mm Allen key T-handle.

2. Remove the front cover of the vacuum pump. 

3. Remove the O-rings. 

4. Now attach the claw-blocking tool to the claw. 

5. Remove the claw screw and washer. 

6. For pump size 065-100 use a 13mm spanner to remove the claw screw and washer. 

7. For pump size 150-400 use a 10mm Allen key to remove the claw screw and washer. 

8. Now use the claw puller to remove the claw. 

9. Remove the claw-blocking tool.

10. Remove the other claw using the claw puller tool. 

11. Take out the shims. 

12. Now you can clean the inner part of the claw housing. 

13. Focusing now on the claws, remove the clamping elements and clean the claws. [Note: for sizes 065-100 and 150-200 there will be 2 clamping elements, and for size 300-400 there will be 4 clamping elements.]

Inspect all of the disassembled parts and critical surfaces for damage, scratches or foreign material deposits. Clean them with a lint-free cloth and cleaning liquid before assembly. 

Inspect the panels for any damage. Clean them with a lint-free cloth and cleaning liquid before moving on to assembly.

For assembly, you will need the following tools: 

1. Allen key T-handle

2. Allen key set

3. Feeler gauge

4. 13mm spanner

5. 18mm spanner

Special tools needed: 

1. G10016044 – Claw blocking tool for pumps 65-100

2. G10016043 – claw blocking tool for pumps 300

1. Begin by fitting the shims.

2. Apply ceramic past on both of the shafts. 

Note: Apply ceramic paste only along the shaft length that touches the claws.

3  Insert the clamping elements and pressure washer into the claw. [Note:  for sizes 065-100 and 150-200 there will be 2 clamping     elements, and for size 300-400 there will be 4 clamping elements.]

4  Now fit the claw back onto the vacuum pump shaft.

5  Use the claw fixing tool to help tighten the claw. For pumps sized 065-100, use a 13mm spanner and 41Nm of torque. For pumps     sized 150-400, use a 10mm Allen key with 120Nm of torque.

6  Now remove the claw fixing tool.

7  Check that the claw can rotate freely and move it into this position (see the red marking).

8  Now use the feeler gauge to ensure the claw has the correct clearance. The clearance should be 10-40μm. If the clearance is not     within these limits, remove the claw and reinstall it according to the procedure above. 

9  Now insert the clamping elements and pressure washer into he claw. [Note: for sizes 065-100 and 150-200 there will be 2 clamping      elements, and for size 300-400 there will be 4 clamping elements.]

10  Fit the claw back onto the shaft of the vacuum pump. 

11  Now use the claw fixing tool and fix the screws to the claw casing. For pumps sized 065-100, use a 13mm spanner. For pumps;       sized 150-400, use a 10mm Allen key.

12  Now measure the gap between the claws using a feeler gauge. [Note: Gap b-b must be at least 20μm larger than gap a-a. 

13  Now tighten the claw. For pumps sized 065-100, use a 13mm spanner and 41Nm of torque. For pumps sized 150-400, use a 10mm       Allen key with 120Nm of torque.

14  Next, remove the claw-blocking tools and feeler gauges.

15  Check the rotation of the claws, specifically the gaps at a-a and b-b. if any clearance is not within the limits, remove the claw and       reinstall it according to the procedure above.

16  Now rotate the claws 180 degrees and check the gaps again at a’-a’ and b’-b’. If any clearance is not within the limits, remove the       claw and reinstall it accordingly. 

17  Now measure Clearance A, which should be within 10-40μm. If any clearance is not within the limits, remove the claw and       reinstall it accordingly.

1. Begin by using the claw-fixing tool.

2. Use the feeler gauges from before and loosen the claw. For pumps sized 065-100, use a 13mm spanner. For pumps sized 150-400, use a 10mm Allen key.

3. Now tighten the claw into place with new screws. For pumps sized 065-100, use a 13mm spanner and 41Nm of torque. For pumps sized 150-400, use a 10mm Allen key with 120Nm of torque. 

4. Now remove the claw blocking tool, feeler gauges.

1. Begin by fitting the O-rings back into place. 

2. Now put the front cover back into place. Use a 6mm Allen key T-handle and 25 Nm of torque to tighten the screws. 

1. Fill the vacuum pump oil to the maximum level of the vacuum pump.

2. Now fit the inlet with O-rings and the cap. Tighten into place with a13mm spanner and 10 Nm of torque.

1. **Applicable for VSD+ variants only** tighten the Pt1000 temperature sensor with a 5mm Allen key and 10 Nm of torque. 

1. Now fit the side covers back onto the pump. Use a 5mm Allen key and 10 Nm of torque to tighten the screws.

2. Now fit the pressure sensor back on the pump. **Please note that the pressure sensor is not a part of all product variants**

3. Assemble the front panel back onto the vacuum pump. Tighten the screws with a 5mm Allen key, and 10 Nm of torque.

You have now completed the oil change on your dry claw vacuum pump! Remember to store your tools in a safe place, ready for the next service. 


For more information on our vacuum pump preventative service options, visit our service page

If you need help servicing your vacuum pump, contact us