Generator Probe Maintenance

Proper cleaning, inspection, and routine maintenance help keep PRO Scientific generator probes operating efficiently and can extend the life of the generator and homogenizer motor unit.

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Maintain Consistent Homogenization Performance

When homogenization results change or processing efficiency decreases, generator probe maintenance and cleaning should be among the first items reviewed.

Generator probes should be regularly disassembled, cleaned, and inspected. Wearing components such as PTFE washers and bearings should be replaced when necessary.

Generator Maintenance Resources

Quick Care Guide

Review basic inspection, cleaning, and generator probe care recommendations.

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Replacement Parts

Find replacement bearings, washers, and other generator probe components.

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Service & Repair

Request return paperwork for a homogenizer or generator requiring service.

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Tips for Maximizing Generator Probe Performance

Never Run the Generator Dry

The generator requires a liquid sample or medium to lubricate the bearings during processing. Without sufficient liquid, PTFE bearings can wear prematurely and damage the generator. If dry sample processing is required, contact PRO Scientific to discuss appropriate bearing materials and equipment configuration.

Faster Is Not Always Better

Begin homogenization at a lower RPM and gradually increase speed to the desired processing level.

A rapid increase in speed can push sample away from the generator and reduce processing efficiency.
With very small sample volumes, excessive speed may move liquid through the generator faster than the sample can recover around the probe.
When using Multi-Gen 7XL probes, operation above half speed, approximately 16,000 RPM, is not recommended unless the equipment has been specifically evaluated for that requirement.

Use the Correct Sample Volume

Processing too little sample at excessive speed can damage a generator probe. Make sure the generator diameter, length, sample volume, vessel dimensions, and operating speed are appropriate for the application.

Review the Operating Manual

Follow the instructions in the equipment manual when attaching, dismantling, assembling, and operating the generator. If you need a replacement manual, contact PRO Scientific .

Important Maintenance Notice

Do not operate a generator with missing, damaged, or excessively worn components. Doing so may damage the generator and/or homogenizer motor unit.

PRO Quick Connect Generator Probe Maintenance

Use the following checks as part of routine generator maintenance. For additional information, refer to the Generator Probe Quick Care Guide .

Upper PTFE Washer Check

Check whether the upper white PTFE washer is missing.
Inspect the washer for visible wear or damage.
Replace the washer if it is missing or worn.
Identify the appropriate replacement part by consulting your manual, viewing generator replacement parts , or contacting PRO Scientific.

Lower PTFE Bearing Check

The lower PTFE bearing should be replaced when wear causes excessive movement between the bearing and rotor shaft.

The inside diameter of the bearing fits loosely on the outside diameter of the shaft.
The bearing can be noticeably wiggled or tilted on the shaft.

Refer to your generator spare-parts information or view generator replacement parts .

Upper Stainless Steel Bearing

Replacement of the upper stainless steel bearing should be performed by a PRO Scientific service technician or an authorized distributor.

Mid-Bearing Check

Generators 120 mm in length and longer contain a mid-bearing located approximately halfway along the generator shaft.
The mid-bearing must be lubricated by the sample or liquid during processing.
The sample volume should therefore cover approximately half the length of the generator.
Mid-bearing replacement should be performed by PRO Scientific service or an authorized distributor.

Multi-Gen 7 & 7XL Maintenance

Upper and Lower PTFE Bearing Check

The upper and lower PTFE bearings used with Multi-Gen generator probes are interchangeable.

Replace the PTFE bearing when the inside diameter fits loosely around the rotor shaft or the bearing can be noticeably tilted or moved.
Replacement part: PRO-03-11703P, 6-pack of Multi-Gen lower PTFE bearings.
View Generator Replacement Parts

PRO Scientific Multi-Gen 7XL Generator Probe

Dismantling & Assembly Instructions

5 mm PRO Quick Connect Generator

Assembly

Insert the lower bearing into the bottom of the tube and collar assembly. Use the rotor knife to push the bearing into position until the end of the rotor knife is flush with the bottom of the tube and collar assembly.
Insert the rotor shaft into the upper end of the tube and collar assembly.
Confirm that the rotor shaft rotates freely. If it does not, inspect the upper and lower bearings and replace damaged components.
Insert the rotor knife and rotate clockwise while holding the rotor shaft. Hand tighten only.
Place the PTFE washer onto the shaft, install the rotor shaft collar assembly, align the set screw with the flat on the rotor shaft, tighten, and confirm free rotation.

Dismantling

Unscrew the rotor knife from the bottom of the rotor shaft using the supplied tools.
Remove the rotor knife from the generator tube.
Draw the rotor shaft and collar assembly upward from the tube and remove the PTFE washer.
Remove the lower bearing and replace it when worn.
Loosen the set screw to remove the rotor shaft collar assembly. For convenience, do not completely remove the set screw from the collar.

7 mm, 10 mm, 20 mm & 30 mm PRO Quick Connect Generators

Assembly

Slide the lower bearing onto the rotor shaft.
Attach the rotor knife to the rotor shaft by turning clockwise until hand tight.
Hand tighten only. Do not overtighten the rotor knife.
Insert the rotor shaft into the tube and collar assembly and push the rotor knife upward until the lower bearing is properly seated.
Place the PTFE washer over the upper end of the rotor shaft and install the rotor collar assembly.
Align the collar set screw with the flat portion of the shaft and tighten using the supplied 5/64-inch hex wrench.

Dismantling

Loosen the rotor shaft collar set screw and remove the collar assembly.
Remove the upper PTFE washer and draw the rotor shaft downward from the generator tube.
Reattach the shaft collar to the flat portion of the upper shaft.
Unscrew the rotor knife counterclockwise while holding the collar with the supplied tool.
Remove and inspect the lower bearing. Replace it before wear allows the rotor knife to contact the stator.

Multi-Gen 7 & 7XL Generators

Assembly

Insert the upper PTFE bearing into the upper end of the generator tube with the flange facing outward.
Insert the lower PTFE bearing into the lower end of the generator tube with the flange facing outward.
Slide the shaft into the lower end of the generator tube until the knife is flush with the tube and the threaded shaft extends through the upper PTFE bearing.
Keep the knife flush with the bottom of the tube while hand-tightening the drive collar.
Multi-Gen 7: Insert the screwdriver into the bottom of the generator and turn clockwise while holding the drive collar.
Multi-Gen 7XL: Place the Allen wrench through the open slot of the generator and tighten while holding the drive collar.

Dismantling

Secure the generator using the supplied tool as described in the operating manual.
Firmly hold the drive collar while turning the screwdriver counterclockwise.
Remove the drive collar and slide the rotor shaft and knife assembly from the bottom of the generator tube.
Remove the upper PTFE bearing.
Remove the lower PTFE bearing.
Multi-Gen components may then be cleaned or autoclaved as appropriate for the application and component materials.

Cleaning PRO Generator Probes

Clean the generator promptly after use to prevent sample residue from accumulating on the rotor and stator.
Use cleaning materials and procedures that are compatible with the generator components and the material being processed.
Ensure cleaning processes are compatible with 316 stainless steel and PTFE components where applicable.
For more thorough cleaning, disassemble the generator according to the appropriate instructions and clean the individual components using a validated procedure appropriate for your laboratory.