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NEWS | Dec. 29, 2020

D7RII Dozer: O-ring Seal’s a Big Deal

This article initially appeared in PS 794 (Jan 19), p. 18. 

After a track adjustment on your D7R II dozer, make sure the track adjuster cover is snug on the recoil spring compartment.

While you’re at it, check the cap’s rubber O-ring seal.
Check O-ring seal for damage
Check O-ring seal for damage

If the seal’s missing, squashed or torn, water can get into the oil in the recoil spring compartment. Oil and water don’t mix, especially in hard-working equipment!
Contaminated oil turns milky green
Contaminated oil turns milky green

Replace a bad or missing O-ring seal with NSN 5331-00-859-0396.You’ll find it listed as Item 7 in Fig 63 of TM 5-2410-241-24P (Feb 12).

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