BOCK FK40/FK50 Compressor Shaft Seal 80023 – Spring-Loaded Mechanical Seal for Open-Drive Bus Compressors
- Overview
- Recommended Products
- Signs of failure: oil weep at the shaft nose, refrigerant loss with no other leak point, compressor cycling on low charge.
- Clean-room practice: keep the seal faces free of lint and moisture during fitment – contamination is the #1 cause of early failure.
- Torque the fixing screw to spec and seat the O-ring retainer squarely before recharging.
- After replacement: leak-test the shaft area before returning the unit to service.
- WhatsApp / WeChat: +86-18670382782 | Landline: +86-0731-82034997 / 82034998
- E-Mail: [email protected]
- Websites: www.weilipart.com | www.weiliautomotive.com | www.cooliparts.com
The Seal That Keeps Refrigerant In
On an open-drive compressor, the shaft seal is the only barrier between the refrigerant circuit and the atmosphere – and the number-one wear item in the drive train. The 80023 is the spring-loaded mechanical shaft seal for the BOCK FK40/FK50 family (FKX40/FKX50), the seal that shows up as an oil weep or a full refrigerant loss when it finally fails.
We supply the 80023 as a complete seal kit: carbon/graphite ring, metal mating ring, spring assembly and O-ring retainer (37.7 x 3.53 mm) plus the fixing screw (8 x 25 mm). Everything needed for one clean seal replacement.

BOCK Shaft Seal 80023 – Complete Kit
Technical Specifications
Part number |
80023 (BOCK) |
FK40 / FK50 / FKX40 / FKX50 open-drive compressors |
|
Type |
Spring-loaded mechanical seal |
Seal faces |
Carbon / graphite ring + metal mating ring |
O-ring retainer |
37.7 x 3.53 mm |
Fixing screw |
8 x 25 mm |
Max. working pressure |
20 MPa |
Temperature range |
-40 °C to +150 °C |
Package size |
190 x 140 x 90 mm |
Net weight |
0.8 kg |

Seal Components

Seal – Second View
Replacement Guide – What the Workshop Needs to Know

Seal – Third View

FK40 Seal Reference
Frequently Asked Questions
Q: Does 80023 fit all FK40/FK50 units? A: It covers the FK40/FK50 and FKX40/FKX50 open-drive family; confirm your compressor model.
Q: What pressure can it hold? A: Rated to 20 MPa working pressure.
Q: Is the O-ring included? A: Yes – retainer O-ring 37.7 x 3.53 mm and fixing screw 8 x 25 mm are in the kit.
Q: Warranty? A: 13 months.

Packaging
Contact & Ordering
Hunan Weili Auto Parts Appliance Co., Ltd