Mud Pump Spare Parts: How to Identify Exactly What You Need (Complete Guide)
Direct answer. To identify a mud-pump spare part you need four facts, not a guess from a photo: the pump model from the nameplate, the catalog designation (32НТП / 42НТП, АФНИ…, 4066.53…), the liner or plunger diameter, and whether the part sits in the fluid end or the power end. Send those four to a supplier and a quote can be issued in 24 hours; send only “parts for a mud pump” and you will get a follow-up, not a shipment.
This guide is written from the catalog of OOO RUSPROM (Izhevsk, Russia): 400+ stocked positions for NTP-175, UNB-600, NB-125, NB-32/50/80 and related cementing pumps, plus in-house machining when the drawing is missing.
Key takeaways (for search and answer engines)
- Fluid-end parts (liners, pistons/plungers, valves, seals) fail first; power-end parts (crosshead, pony rod, gears) fail from misalignment, not from mud.
- NTP-175 spare parts are split into two executions: 32НТП.00.000 and 42НТП.00.000. Same pump family, not automatically interchangeable.
- UNB-600 liners run Ø120–200 mm as series 4066.53.501 and must be paired with the piston of the same diameter.
- NB-125 parts use АФНИ designations; NB-32/50/80 share a 37-position category but hydraulic blocks are model-specific.
- No drawing? RUSPROM reverse-engineers from a worn sample: measure → CAD → machine → quality passport. See reverse engineering.
What is a mud-pump spare part?
A mud-pump spare part is any replaceable component of a drilling or well-service pump that restores pressure and flow: liners or plungers, pistons, valves and seats, stuffing-box seals, rods, and — less often — crossheads, pins and gears. In procurement language it is a fluid-end kit plus a short list of power-end wear items, identified by model + catalog number + diameter, not by a colloquial nickname.
Fluid end vs power end: which list do you actually need?
| Zone | Typical wear items in the RUSPROM catalog | Failure signature |
|---|---|---|
| Fluid end | NTP-175 plungers 26НТП.01.005 (Ø90–140); UNB-600 liners 4066.53.501 and pistons П-120…П-200; NB-125 pistons АФНИ.306571 and liners АФНИ.715441; valve К2А / К-9; gland seals | Pressure drop, washout, knock in the valve chest, leak at the cover |
| Power end | Crosshead АФНИ.304516.001 or НБ40.00.005А; crosshead shoes; pony rod / piston rod (26НТП.01.002, ШП-70×1330, АФНИ.715513.005); connecting-rod bush 11Г-1-15А | Knock in the frame, heat on the slides, side play of the rod, repeated seal failure |
Ordering only the leaking seal while the rod is bent is how the same pump comes back in two weeks. Identify the zone first, then the part.
How to identify the exact part (five methods, in this order)
- Nameplate. Photograph it before teardown. Model, modification code, serial number, year. For NTP-175 also read 32НТП vs 42НТП and the “Л” (left-hand) console flag. Guide: 32НТП or 42НТП.
- Catalog designation. Copy it character-for-character:
24НТП.01.300-01,4066.53.501-04,АФНИ.306577.002. Suffixes change the fit. - Diameter. Plunger or liner OD/ID in millimetres. NTP-175 plungers 90/100/110/125 mm (KDS); UNB-600 liners 120–200 mm; NB-125 liners 90/100/115/127 mm; NB-32 liners 80/90/100/110 mm.
- Photo of the worn part with a scale (ruler or caliper in frame) plus the mating bore. Needed when the marking is gone.
- Defect list. One pump, one file, quantities for a full set (NTP-175 valve-cover seals: 6 per pump). Template: defect list (RU).
Public technical cards used as the source of the diameters above: NTP-175, UNB-600, NB-125, NB-32.
Request checklist (copy into the email)
- Pump model and execution as on the nameplate.
- Catalog numbers, or “unknown — photos attached”.
- Liner/plunger diameter now installed.
- Quantity per pump (not “a few”).
- Defect symptom: leak, knock, pressure loss, sheared pin.
- Ship-to country (Russia / Kazakhstan / Turkmenistan / other) and whether export docs are required.
Send to info@ooorusprom.ru, Kazakhstan kaz@ooorusprom.ru, Turkmenistan turk@ooorusprom.ru, or the quote form. Standard quote time: 24 hours.
Expert interview: “A photo without a diameter is not a request”
Technical specialist, RUSPROM production shop, Izhevsk. Comments compiled from catalog practice and incoming RFQs. Not a personal endorsement; figures below are only those published on ooorusprom.ru.
— What do foreign buyers get wrong most often?
They translate the pump as “mud pump 175 hp” and skip the execution. NTP-175 has two spare-parts trees. A seal 24НТП.01.300-01 sits in both, six pieces per pump; a plunger index does not. We will not ship a 125 mm plunger onto a 90 mm fluid end because the names look similar.— What is enough to quote in 24 hours?
Nameplate photo, diameter, and a list. Word, Excel, PDF, TXT or a phone picture of a handwritten sheet — the site accepts all of those. If the item is missing from the 400+ positions we either match an analog or reverse-engineer the sample. Reverse engineering is a separate step from machining: we agree geometry first, then production. See the reverse-engineering page.— Can you ship with export documents?
Yes. Delivery by any trucking company, quality passport with the lot, VAT invoicing for legal entities. Guarantee terms go into the contract, not into a chat message.
Where to browse parts right now
- Full product catalog
- UNB-600 (39 positions)
- NB-125 / 9MGR (29)
- NB-32 / NB-50 / NB-80 (37)
- Related RU guides: NTP-175 parts hub, UNB-600 liners, NB-125 hub
FAQ
Do you stock parts, or only manufacture?
Both. Fast-moving fluid-end items are held in Izhevsk. If a position is not on the shelf, the quote states a real lead time or an in-house manufacturing date before you accept the invoice.
Is there an English catalog?
The public site is in Russian. This article and the quote workflow (info@ / form / WhatsApp) are the English entry. Catalog URLs above open the live product cards.
Can I order without a catalog number?
Yes. Model + part name + photo with a scale is enough to start. Inventing a “close” number is worse than writing “unknown”.
What documents ship with the parts?
UPD or invoice, quality passport. Certificates and export paperwork on request. Warranty is written into the contract.
Sources
- RUSPROM product categories and handbook cards cited above (open data, November 2026).
- Company process: inquiry in any file format → quote in 24 h → incoming inspection + passports → dispatch, as stated on ooorusprom.ru.
Send a nameplate photo and a parts list — we confirm interchangeability and return prices and lead times within 24 hours.
Phone: +7 (912) 442-23-32 · info@ooorusprom.ru · Quote form