Four References, Four Compressor Families — Bus and Truck Compressor Shaft Seals

1. The Cheapest Repair on the Compressor

A shaft seal is a small part with an outsized effect on cost. When the seal goes, refrigerant weeps along the shaft and oil traces appear around the clutch — but the compressor behind it is usually still sound. Replacing the seal restores the unit; replacing the compressor does not have to.

We hold four seal references covering three compressor families. They are not interchangeable, and they are bought by reference rather than by measurement — which is what this page is organised around.

2. BOCK FK40 / FK50 and FKX40 — Reference 80023

80023 is recorded with the applicable compressor model FKX40 4N / 4P / 4T, and the listing title covers BOCK FK40 / FK50. Both statements come from the same listing — read them together rather than choosing one.

The reference is carried with a set of cross-reference numbers: OE 0001300832, 200170, 240174672, 50750 and 68982A. If the number on your old seal matches any of those, you are in the right place.

3. Bitzer 4-Series — Reference 37403604

37403604 is recorded for the Bitzer 4NFCY, 4PFCY, 4TFCY and 4UFCY. Its type is stated as a *bitzer compressor shaft seal*, and the materials are recorded as aluminium alloy, paper and steel.

This one is worth looking at as a kit rather than a single component: the contents are stated as ring, seal, gasket, spring and screw. That is the set you need to reseal the joint rather than to replace one ring.

4. Thermo King X426 / X430 — References 22-1101 and 22-1103

Two references cover the Thermo King X426 and X430 compressors: 22-1101 and 22-1103. They are listed separately and are not two names for one part.

22-1101 is recorded with a fitment covering truck refrigeration units, and one of its listings is described as a shaft seal kit. 22-1103 is recorded as an aftermarket seal, with 221103 as the alternative written form of the reference.

5. Seal or Kit: What Each Listing Actually Ships

This is the distinction that causes the most returns in this category. A single seal replaces one component. A kit restores the joint. The listings in this range do not all record the same thing in the same field.

• 80023 seal — recorded as a single item. 80023 kit — recorded with the contents stated as a BOCK shaft seal.
• 37403604 — contents stated as ring, seal, gasket, spring and screw.
• 22-1101 — listed twice in this range, once as an aftermarket seal and once as a shaft seal kit.
• 22-1103 — recorded as a seal, with no kit contents stated.

6. Cross-Reference Table

Shaft seal 80023 for BOCK FK40 / FK50 and FKX40 4N / 4P / 4T.

80023 kit version — contents recorded as a BOCK shaft seal.

37403604 for the Bitzer 4-series — ring, seal, gasket, spring and screw.

22-1101 for Thermo King X426 and X430 compressors.

22-1103 — the second Thermo King reference in this range.

7. Enquiry Checklist

• Quote the reference — 80023, 37403604, 22-1101 or 22-1103.
• Say whether you need the seal or the kit for the 80023 and 22-1101 references; for the others, tell us what your old part consists of.
• Name the compressor — BOCK FK40 / FK50, Bitzer 4-series, or Thermo King X426 / X430.
• Send a photograph of the old seal along with the compressor plate if the number is unreadable.

Q1. Are 22-1101 and 22-1103 the same seal?

No — they are two separate references for the Thermo King X426 and X430 compressors, listed independently, with different written forms and different package data.

Q2. Which seal fits a BOCK FK40?

80023, with the applicable compressor model recorded as FKX40 4N / 4P / 4T and the title covering BOCK FK40 / FK50. The listing also carries the cross-reference numbers OE 0001300832, 200170, 240174672, 50750 and 68982A.

Q3. Do you sell the seal on its own or only as a kit?

Both, depending on the reference. 37403604 is recorded with kit contents of ring, seal, gasket, spring and screw. 80023 exists as a single item and as a kit. 22-1101 is listed both as a seal and as a shaft seal kit.

Q4. Which seal is for the Bitzer 4-series?

37403604, recorded for the Bitzer 4NFCY, 4PFCY, 4TFCY and 4UFCY.

Q5. What warranty applies?

1 year on all four references.

8. Manufacturing Base and Capacity

Production is vertical enough to control the parts that cause most field failures, and the partner network is large enough to absorb seasonal peaks without pushing lead times out.

• Experience — more than 15 years in bus and truck air-conditioning parts.
• Plant — Xiangtan Economic and Technological Development Zone, Hunan Province, China. 80+ employees across 5,000 – 10,000 m².
• Scale and reach — annual sales of over 90 million yuan, an annual output of more than 800,000 units, and exports to more than 50 countries.
• Processes held in-house — motor winding, injection moulding, stamping, and final assembly with testing. The whole chain from a coil to a finished assembly is inside the company, not sub-contracted.
• Elastic capacity — 68 collaborating plants form a flexible supply chain, which is how a peak-season ramp-up or a large order is absorbed without renegotiating the schedule.
• Track record — on Alibaba.com for more than 12 years as a Gold Supplier, store rating 4.7 / 5, on-time delivery rate 91.2%.
• Communication — average response time ≤ 3 hours, timely reply rate 99.07%, and roughly 52% of enquiries answered within five minutes. Workday enquiries are answered the same day, with staff on rotation for time-zone markets.
• Recognised status — a Hunan provincial high-technology enterprise, and platform-rated as a leading factory in air-conditioning systems.

Come and look. A factory visit or audit can be arranged — the address and line access are open to buyers who want to verify capacity before committing to a programme.

9. Inside the Plant: Production Line, Equipment and Warehouse

These are photographs of the plant that builds the part on this page — the shop floor, the winding line, the assembly stations and the warehouse the goods leave from. Nothing here is a stock image, and a factory visit or audit can be arranged if you want to walk the line yourself.

The plant in the Xiangtan Economic and Technological Development Zone, Hunan Province, China.

Assembly line — blower and fan assemblies built and inspected at the bench.

In-house motor winding — stators wound on an automatic winding machine.

Production line — components staged at the stations along the line.

Finished-goods warehouse — export cartons staged for dispatch.

Brand wall and the on-site certificate and reference display at the plant.

Come and see it. The address and line access are open to buyers who want to verify capacity, equipment and quality control before committing to a programme. Ask us to arrange a visit, or send your own or a third-party inspector (SGS, BV or TÜV) — pre-shipment inspection to a standard you nominate is part of the process, not an exception.

10. Order Quantity and Lead Time

Two numbers decide whether a replacement part is worth stocking: the smallest quantity you can order without tying up capital, and how long the goods take to leave the factory. Both are published on the corresponding Alibaba.com listing and reproduced below.

Minimum order quantity (MOQ). Standard catalogue items start from as few as 1 – 2 pieces (some blowers from 1 piece, condenser fans from 2 pieces); batch items are typically 6 – 50 pieces; customised items depend on the tooling and process involved. Small-batch trial orders are welcome — the usual route is to test the quality on a small order and scale up once it is proven.

Lead time. Production time is the interval between an order being confirmed and the goods being ready for dispatch. Where the official listing publishes a figure for the reference you need, it is reproduced in the table on this page; the exact figure for your quantity is confirmed on the quotation.

Quote your quantity and we confirm both figures in writing. Order quantity, production time and shipping method are confirmed with the quotation, so nothing depends on an assumption about your volume.

As published on the official listing for each reference above. Production time is the period stated to produce the goods before dispatch; the exact figure for your quantity is confirmed on the quotation.

11. Quality System and Certification

This part is produced under the same quality system that covers our entire bus and truck air-conditioning range, and the system is independently certified rather than self-declared.

What this means when you buy: the inspection regime is auditable and the test data can be provided to you, so the acceptance criteria are something you can verify rather than take on trust.

12. Certification File: Numbers, Issuers and Validity

Buyers who need to put a certificate in a quality file should not have to accept a claim without a number. Every approval the factory holds is listed below with its own certificate number, issuing body, validity date and, where one was issued, the test report number behind it.

Which certificate applies to which product. The IATF 16949 registration and the ECE E57 type approval are held by the manufacturing company for the plant. The CE, RoHS, Low Voltage/EMC and ECE R10 approvals are held for the brushless fan range; each certificate names the models it covers. Ask for the certificate PDF for the reference you are buying and check it against its own model list.

IATF 16949:2016 registration certificate 126765/A/0001/SM/En — valid to 05 June 2026.

ECE type approval E57*COP*1682, Republic of San Marino — valid to 14/05/2026.

CE / EMC certificate TBC-C-202308-0315-1 — test report TBR-C-202308-0315-1.

RoHS declaration TBC-C-202308-0315-2 — test report TBR-C-202308-0315-2.

Low Voltage / EMC certificate M.2024.206.C110335 — valid to 25.11.2029.

13. Replacement Coverage and Customer Base

Matching is done on evidence, not on a guess, because a fan or blower that is 10 mm out will not seal and a clutch that is one groove form out will not drive.

Cross-referenced coverage runs across SPAL, Valeo, Thermo King, Webasto, Scania, Yutong, DAF, Mercedes, Volvo and Hwasung Thermo. Where a match cannot be confirmed, the risk is stated up front and a sample is proposed for verification instead.

We supply wholesalers and repair chains in multiple countries, with the Middle East, South America, South East Asia and Eastern Europe as the principal export regions. Long-term partners receive dedicated account service, priority production scheduling and tiered rebates.

14. Buyer FAQ

Q1. Brushed or brushless — which should I stock?

Brushed motors use carbon-brush commutation: proven, economic and easy to maintain, typically 1,000 – 3,000 hours of life, suited to price-sensitive replacement demand. Brushless motors use electronic commutation with no brush wear and reach 10,000 hours or more, with higher efficiency, lower heat and less noise — better for long-running, high-temperature or new-energy vehicles. Both are produced here.

Q2. Why are bus and truck parts mostly 24 V?

Bus and truck electrical systems carry more equipment over longer harness runs, so 24 V reduces the current for the same power, which allows thinner cable and cuts losses and heat. Passenger cars are mainly 12 V. That is why the product range is predominantly 24 V, with 12 V / 24 V universal references covering passenger cars.

Q3. Why is an aftermarket replacement cheaper than a genuine part?

The difference comes from brand premium and channel mark-up on the genuine side, and a shorter route to market on the replacement side. A properly made replacement is matched on material and tested to the same duty, so performance meets the application — which is why it is worth checking for an audited factory and available test data rather than buying on price alone.

Q4. What should I send to avoid a mismatched part?

The most reliable inputs are: the OE number, the brand and model reference, or photographs of the old part together with measurements. Any one of those resolves the fitment in most cases. If a match cannot be confirmed, we will say so rather than ship on an assumption.

Q5. Can you supply test data for the part I am buying?

Yes — component testing covers dynamic balance, electrical performance, high and low temperature, and endurance life on in-house instruments, and the test data can be provided to support your quality file.

15. OEM / ODM and Customisation Process

Four routes cover practically every aftermarket customisation request, from a private label on a part we already build to a component that does not exist yet.

How the project runs: requirement collection, then solution confirmation against your sample or OE dimensions, then sample production (approximately 30 days for standard sample-based work; brand-new tooling depends on mould complexity), then mass production with 40 – 60 days stocking after the sample is approved. A pre-production sample is supplied for your inspection before the batch starts.

Tooling and fees: small changes such as silk-screen, labels or harness length are usually free or carry only a small revision fee. New tooling carries a mould cost, which is refundable or amortised once the agreed order volume is reached. Customised minimum order quantities depend on the tooling and process involved.

Confirm the Right Seal Reference

Hunan Weili Auto Parts Appliance Co., Ltd. — founded in 2007, ISO 9001 & IATF 16949 certified manufacturer of bus & truck AC parts, electric fans, blowers, lighting and alternator components.

Send us the number on your old seal, or a photograph of the compressor plate, and we will confirm whether you need the seal or the kit within 24 hours.

WhatsApp / WeChat: +86-18670382782 | Landline: +86-0731-82034997 / 82034998

E-Mail: [email protected] | Websites: www.cooliparts.com | www.weilipart.com | www.weiliautomotive.com

Send us your OEM part number, vehicle model or drawing — we will reply within 24 hours with a quotation and technical data sheet.