[ Diffusion Pump Service · Cleaning & Loaner Exchange ]
Diffusion Pump Jet Stack Cleaning
& Loaner Exchange Service
Keep your vacuum coating operation moving while your jet assembly is professionally cleaned. YTI removes diffusion pump oil residue and process contamination, inspects critical jet-stack components, and can coordinate a compatible loaner stack so you can service your original assembly with less disruption to production.
A YTI diffusion pump specialty
Clean jet assemblies. More reliable high-vacuum operation.
The diffusion pump jet stack directs vapor through carefully shaped nozzles to create the pumping action needed for high vacuum. Over time, degraded diffusion pump oil, process residues and deposits can collect on jet caps, nozzle passages and internal surfaces.
Jet stack cleaning addresses this internal contamination without automatically committing to a complete diffusion pump replacement. YTI evaluates the assembly, removes deposits using a compatible cleaning method, examines the jet stages and guides the next maintenance step based on the condition of the hardware.
For facilities that cannot leave a coating line idle while the original jet stack is serviced, YTI also offers a loaner-stack exchange option for compatible equipment. If the pump requires more extensive work, YTI provides complete diffusion pump refurbishment as a separate service.
Choose your service path
Jet stack cleaning or a loaner exchange
Both options begin with a review of your existing diffusion pump and jet assembly. Choose the service that best matches your maintenance window and production needs.
Professional Jet Stack Cleaning
Send YTI your existing jet assembly for cleaning and inspection. Ideal for planned maintenance, a scheduled shutdown or a spare assembly that can be serviced off-line.
- Evaluation of jet caps, stages and visible deposits
- Removal of residual diffusion pump oil and contamination
- Solvent and residue cleaning appropriate to the hardware
- Thorough drying and controlled reassembly guidance
- Follow-up recommendations if damage or wear is found
Loaner Jet Stack Exchange
Have YTI confirm a compatible loaner assembly before your maintenance window. Install the temporary stack, then send your original assembly to YTI for professional cleaning.
- Model and configuration compatibility review
- Loaner availability and exchange terms confirmed upfront
- Coordinate the temporary swap around your maintenance window
- Send your active jet stack to YTI for cleaning
- Receive your serviced original and return the loaner
Protect your production schedule
How the YTI loaner stack exchange works
A temporary replacement jet stack can help keep your diffusion pump in service while its original assembly receives attention. The exchange is planned around fitment and your scheduled service window.
Confirm Your Pump
Send the manufacturer, model, size, stack photos and operating requirements. YTI verifies whether a matching loaner can be supplied.
Receive a Loaner
After availability, shipping and exchange terms are agreed, a suitable loaner is coordinated for your maintenance window.
Send Your Stack
Swap assemblies using the applicable pump manufacturer’s procedures, then package and ship your existing jet stack to YTI for cleaning.
Restore the Original
YTI cleans and inspects the original. Once it is returned and reinstalled, the temporary loaner is shipped back under the agreed terms.
Technical cleaning workflow
Our six-step diffusion pump jet stack cleaning process
A methodical process helps remove degraded oil and stubborn residue while preserving the geometry and cleanliness of each jet stage. Procedures, solvents and seals are selected based on the manufacturer, construction materials and contamination present.
Cool, Isolate & Disassemble
The pump is allowed to cool completely and is safely isolated before opening. The jet stack is carefully removed from the housing and its original configuration is documented for correct reassembly.
Initial Solvent Cleaning
Residual diffusion pump fluid and heavy deposits are removed from the jet stack and accessible pump surfaces using material-compatible solvents, such as acetone where appropriate, and lint-free wipes.
High-Purity Residue Rinse
Where compatible with the assembly, a high-purity anhydrous isopropyl alcohol rinse removes remaining film from the first cleaning stage. Contaminated surfaces are inspected and re-cleaned as needed.
Complete Drying & Inspection
Components are thoroughly dried using a controlled, contamination-free method appropriate to the solvent and equipment, then checked for remaining residue, damage, alignment and obstructions.
Reassembly & Alignment
Jet stages are assembled in the correct order. Where the pump uses a notch-and-index feature, the assembly is aligned to the corresponding locator in the boiler as specified by the manufacturer.
Seal Review & Controlled Restart
O-ring and fill/drain seal condition is reviewed; replacement is recommended as required. Dry-nitrogen purging and pump startup follow the applicable manufacturer procedure and agreed service scope.
Professional maintenance note: Diffusion pump oil and solvent residues require proper handling. Solvents may be flammable, and heating or drying must not introduce an ignition source. Cleaning, compatibility checks and restart procedures should follow the pump’s manufacturer documentation and site safety requirements.
When to request service
Signs a diffusion pump jet stack may need cleaning
Contaminated jet assemblies can contribute to declining pump performance. These symptoms can also have other causes, so YTI can help determine whether stack cleaning, oil service, leak testing or a full pump rebuild is the best next step.
Visible Oil Residue
Heavy oil film, varnish-like deposits or dark contamination on nozzles and accessible internal surfaces.
Slow Pump-Down
Longer chamber cycle times or slower high-vacuum recovery compared with normal operating conditions.
Unstable Base Pressure
Difficulty achieving or maintaining a consistent vacuum level, after other system causes are considered.
Process Contamination
Oil carryover or unwanted residue affecting process cleanliness or coating quality.
Oil Degradation
Discolored or contaminated fluid indicating the need to evaluate the boiler, jet stack and fluid service history.
Planned Maintenance
A scheduled outage presents an opportunity to service the original jet stack before performance declines.
Equipment & model review
Diffusion pump brands and legacy systems
YTI works with diffusion pumps from major manufacturers and supports many legacy vacuum systems. Jet stack interchangeability is not determined by pump diameter alone. Nozzle geometry, number of stages, indexing, clearances and original pump configuration must be reviewed before a temporary replacement is approved.
Have an older or unidentified jet assembly? Send nameplate photos, stack measurements and images of the jet cap and lower alignment feature so YTI can evaluate the best service path.
- Varian
- Agilent
- CVC
- Balzers
- Leybold
- Legacy Pump Models
Need a clean jet stack without a long production interruption?
Ask YTI about professional cleaning and a compatible temporary loaner. Share your pump make and model to get started.
Common questions
Jet stack cleaning & loaner exchange FAQs
What is a diffusion pump jet stack?
Can YTI clean just the jet stack instead of rebuilding the entire pump?
How does the loaner jet stack exchange work?
Will any jet stack fit a diffusion pump of the same size?
What solvents are used to clean diffusion pump jet assemblies?
Does cleaning include new diffusion pump oil and seals?
How much downtime will the loaner program save?
How can I get a quote for cleaning or a loaner stack?
Related YTI services
More diffusion pump support from YTI
Talk with a YTI diffusion pump specialist
Tell us what pump you’re using, what condition the stack is in and when your production line can be serviced. We’ll help review cleaning and loaner exchange options.
