O-Ring + Backup Ring / Kubota L4508/L4708/L5018/M5000/M6040 / 5-18-107-05

O-Ring of the three-point hydraulic lift piston (o-ring 5-27-101-78 , 3A111-09830) with an internal diameter of 78.80 mm and a thickness of 5.80 mm for Kubota tractors of the Kubota L4508, Kubota L4708, Kubota L5018, Kubota M5000, Kubota series M6040 and others.

An O-ring is a type of circular seal and comes in many sizes and diameters. The main task of the O-ring sealant is to seal in places where there is no high pressure, but also places subject to high pressure. The O-ring sealant, under the influence of high pressure, acquires properties similar to liquids (surface tension, plasticity, etc.), which gives very good sealing properties.

A retaining ring is a rigid ring, usually made of plastic, that protects O-ring seals against damage caused by the high pressure and temperature inside the hydraulic system during operation. Back-up-ring is a ring whose main task is to prevent the O-ring from being squeezed into the gap between the sealed surfaces and protects the sealant from changing its shape, which is possible when high pressure and temperature are applied to the seal. If the pressure acts on the O-ring from two directions, we use a resistance ring on both sides of the O-Ring seal.

Dimensions (o-ring):

• inner diameter: 79.30 mm,
• thickness: 5.75 mm,
• original part numbers: 3A111-09830, 04810-008000
• comparison numbers: 5-27-101-78 ,
• part numbers: 5-18-107-05.

Dimensions (back up ring):

• inner diameter: 75.50 mm,
• thickness: 1.00 mm,
• original part numbers: 31391-37330,
• comparison numbers: -,
• part numbers: 5-18-107-05.

Tractor models :

Kubota :

• Kubota L4508,
• Kubota L4708,
• Kubota L5018,
• Kubota M5000,
• Kubota M6040.

The O-ring sealant is also resistant to high temperatures during operation, and the selection of the appropriate one depends on its purpose and the material from which it is made. O-ring seals in high-pressure devices require the use of a special support ring.

Warehouse :
M01:A41:S02)