The 8N's hollow steering shaft is a blind hole. (don't ask how I know) I believe the 100 series make it hollow and fills the steering gear box..... ....Dell On my 52 8N, open battery gas fill door, look down, close to oil pressure gauge, you should see the referenced cap screw (I always called it a bolt), remove to check and fill steering box. You doubt? check bottom of hole with "L" shaped wire probe. I use 140wt outboard gear oil which comes in a pointed squeeze tube that I can insert in the hole. SERVICE LETTER LETTER No. 1-T-5 PAGE No. 1 DATE April 20, 1951 STEERING OIL FILLER PLUG 8N TRACTOR The oil filler plug on the new steering assembly (8N--3503-B) has been discontinued in production. The hole is filled with metal, completely sealing it. Consequently, it is necessary to use the cap screw on the right hand side, which secures the instrument panel support to the steering housing, when putting lubricant into the steering assembly. The housing should always be filled to the level of the cap screw-hole to insure that the top bearing (8N-3571), receives lubrication. It is recommended that multipurpose S.A.E. 90 gear lubricant be used to fill the steering assembly when the level falls below the cap screw.
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