Gearbox Housing Gasket

The Ø110 mm gearbox housing gasket is a sealing element used in the drive/gearbox zone of industrial pressure washers. Its job is to keep the housing joint tight, which helps reduce oil leaks and protects the gearbox interior from contaminants during operation.

MPN / reference: 405037
Diameter: Ø110 mm

APPLICATION

The gasket is used in typical drive-related service work:

• sealing the gearbox housing joint after disassembly and reassembly,
• repairing leaks in the gearbox/drive area,
• periodic inspections of units used intensively in workshop/service conditions,
• drive-system overhauls performed during washer refurbishment.

SYMPTOMS – WHEN TO REPLACE

Consider replacing the gearbox housing gasket when you notice:

• oil leaks or “sweating” along the housing joint,
• loss of tightness after reassembling the gearbox on an old gasket,
• visible damage after removal (cracks, missing material, deformation),
• contamination around the joint caused by loss of sealing,
• reduced sealing durability after longer use (material aging).

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

• by size: Ø110 mm,
• by manufacturer number: MPN 405037,
• by comparing with the removed gasket: diameter and seating/face profile.

Accurate fit is critical-even a small mismatch in diameter or profile can cause leakage.

COMPATIBILITY

Choose the gasket based on MPN 405037 and Ø110 mm. Indicated application areas (Quadro, Therm, Bully) should be treated as guidance that must be confirmed in the parts list for the specific unit-different gearbox variants may use different seals despite similar naming.

[faq]

Do you replace the gearbox housing gasket every time you open the drive/gearbox?|In practice, often yes-reassembling with an old gasket increases the risk of leaks. The final decision depends on gasket condition and your service standard.

How can I be sure Ø110 mm is the correct size?|Safest is checking the removed part and confirming by MPN 405037. If the gearbox previously leaked, also inspect the mating surfaces of the housing.

Does a leak near the gearbox always mean the housing gasket is worn?|No. Leaks can also come from other seals or connections in the drive area. The housing gasket is especially suspect when the oil trace follows the housing joint line.

What should I watch for when installing a new gasket?|Clean, flat mating surfaces, no scratches/pitting, and even tightening of the housing. After installation, do a leak check.

Does this gasket fit all Quadro/Therm/Bully units?|Do not assume so. Confirm by MPN 405037 and the parts list for the exact gearbox variant in your unit.

[/faq]