I had an oil leak on my front loader and need to check the hydraulic oil level, but have been unable to find the check plug. This 68 Ford 4000 row crop has an 8 speed manual transmission with the high foot plate and the brake lock mounted from what I believe to be the pump mount. This plate does have the square plug on the right side, that one picture on a 4600, which was pointed to as the level check. Is this the proper check point? As for filling, there is a neck with a twist cap sticking out of the lower right side of the bracket on which the seat mounts. Any help would be appreciated! Clif