O-Rings

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O - Ring - Replacement for Bobcat 25K30508 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 25K30508
$4.00 $5.00
O - Ring - Replacement for Bobcat 7418836 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 7418836
$3.00
O - Ring - Replacement for Bobcat 79K16 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 79K16
$4.00
O - Ring - Replacement for Bobcat 79K14 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 79K14
$4.00
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O - Ring - Replacement for Bobcat 7143561 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 7143561
$4.00 $5.00
O - Ring - Replacement for Bobcat 6683233 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 6683233
$3.00
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O - Ring - Replacement for Bobcat 58K120 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 58K120
$3.00 $4.00
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O - Ring - Replacement for Bobcat 54K30126 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 54K30126
$4.00 $5.00
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O - Ring - Replacement for Bobcat 54K30118 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 54K30118
$10.00 $12.00
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O - Ring - Replacement for Bobcat 3974038 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 3974038
$3.00 $4.00
O - Ring - Replacement for Bobcat 55K219 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 55K219
$4.00
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O-Ring - Replacement for Bobcat 3966512 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 3966512
$3.00 $4.00
O-Ring - Replacement for Bobcat 25K30210 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 25K30210
$4.00
O-Ring - Replacement for Bobcat 97K8 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 97K8
$4.00
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O-Ring - Replacement for Bobcat 6558518 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 6558518
$21.00 $28.00
O-Ring - Replacement for Kubota 04811-50550 - PartsOnline
Kubota O-Ring - Replacement for Kubota 04811-50550
$6.00
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Seal - Replacement for Bobcat 7009143 - PartsOnline
Bobcat Seal - Replacement for Bobcat 7009143
$49.00 $58.00
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O - Ring - Replacement for Bobcat 79K6 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 79K6
$3.00 $4.00
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O - Ring - Replacement for Bobcat 79K10 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 79K10
$3.00 $4.00
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O - Ring - Replacement for Bobcat 7356651 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 7356651
$14.00 $18.00
O - Ring - Replacement for Bobcat 7143562 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 7143562
$4.00
O - Ring - Replacement for Bobcat 6811260 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 6811260
$4.00
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O - Ring - Replacement for Bobcat 6689564 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 6689564
$3.00 $4.00
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O - Ring - Replacement for Bobcat 6682949 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 6682949
$3.00 $4.00
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O - Ring - Replacement for Bobcat 58K259 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 58K259
$16.00 $19.00
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O - Ring - Replacement for Bobcat 55K214 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 55K214
$1.00 $6.00
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O - Ring - Replacement for Bobcat 55K204 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 55K204
$3.00 $4.00
O - Ring - Replacement for Bobcat 54K40204 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 54K40204
$2.00
O - Ring - Replacement for Bobcat 54K20002 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 54K20002
$4.00
O - Ring - Replacement for Bobcat 25K40112 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 25K40112
$4.00
O-Ring - Replacement for Bobcat 25K40108 - PartsOnline
Bobcat O-Ring - Replacement for Bobcat 25K40108
$2.00
Drive Axle O-Ring - Replacement for Hyundai XKBT-00428 - PartsOnline
Hyundai Drive Axle O-Ring - Replacement for Hyundai XKBT-00428
$6.00
Backup Ring - Replacement for Hyundai XKCF-00661 - PartsOnline
Hyundai Backup Ring - Replacement for Hyundai XKCF-00661
$25.00
Throttle Body O-Ring - Replacement for Clark 1235257 - PartsOnline
Clark Throttle Body O-Ring - Replacement for Clark 1235257
$8.00
O-Ring (133 x 3.53 x 140.06) - Replaces Scania 1769799 - PartsOnline
Scania O-Ring (133 x 3.53 x 140.06) - Replaces Scania 1769799
$8.00
O-Ring - Replacement for Scania 353158 - PartsOnline
Scania O-Ring - Replacement for Scania 353158
$16.00

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O-Ring Fitment and Compatibility

An O-ring is specified by three things: inside diameter, cross-section thickness, and material. Two of those are invisible at a glance. An O-ring one size thinner in cross-section drops into the groove, looks correct, and seals perfectly well at rest, then weeps as soon as the joint sees pressure, because there is not enough material to be squeezed into the gap it is meant to fill. Common replacements include the O-rings replacing OEM 25K30508, 25K30210, 54K30118, 58K120, 79K14, 79K16, 7418836, 6683233, 6558518, and 3974038.

Material matters as much as size. Compounds differ in what fluid and what temperature they tolerate, and an O-ring that is correct in a hydraulic joint can harden, swell, or go brittle in a fuel or high-heat position. Ordering by the OEM number for the joint keeps the compound right without having to identify it.

Types of Replacement O-Rings

Hydraulic O-rings seal fittings, adapters, cartridge valves, and cylinder joints, and they are the largest group here. In pressure positions they are frequently paired with a back-up ring that stops the O-ring extruding into the clearance gap, and a rebuild that leaves the back-up ring out will seal cold and weep once it is hot and loaded.

Fuel system O-rings seal connectors, filter heads, and injection components on the low-pressure side. Cooling and engine O-rings seal thermostat housings, water pump joints, and covers where a flat gasket would not suit the joint geometry.

Fit O-rings dry-free of grit and lightly lubricated with the fluid the joint carries. Most O-rings that fail early were nicked on a thread or a sharp edge on the way in, not defective in the bag.