Leaking Seal on Jinma 354 4 wheel drive on front kingpin housing. Forum › Forums › Tractor Operation And Maintenance › Leaking Seal on Jinma 354 4 wheel drive on front kingpin housing. This topic has 2 replies, 3 voices, and was last updated 6 years, 3 months ago by DavidPrivett. Viewing 2 reply threads Author Posts August 2, 2018 at 3:06 pm #48091 jonesgroveParticipant Offline Oil is seeping out of my lower left king pin housing at the top joint. Is this just an o ring problem? August 2, 2018 at 7:38 pm #48097 Bob RooksParticipant Offline I would place an oil-sorbent pad under it. Account deleted. August 3, 2018 at 8:52 am #48098 DavidPrivettParticipant Offline I would let it ride since it is the top, but of course you will have to monitor it more closely before you open that bag of worms. you are running 90 wt. in the front axle right, and it is not overfilled. Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In