tinkerer 0 #1 Posted April 6, 2015 After rebuilding the Kohler twin it was time see if this carcass could move. There was no power movement of any type in either direction. The tractor could be pushed manually. The pump was removed to inspect. One "o ring" was unaccounted for(either originally absent or lost while dismantling). The pump was essentially void of oil(traces only) and all internal parts appeared fine. Acquired new square o-rings for reassembly. The charge pump must fill the pump cavity to allow the main pump assembly to function. The sump dip stick indicates the proper amount of fluid(10-30 non detergent oil) and one quart was added to the pump by removing a top port. Is there a preferred way of accomplishing this procedure. The pump manual seems vague on this. Thanks for your much needed support. Share this post Link to post Share on other sites
daveoman1966 3,762 #2 Posted April 6, 2015 Is the PUSH / TOW valve open.... Turn clockwise to CLOSE it. Are there any seeps or leaks where the 4-line manifold connects to the PUMP or the HYD MOTOR at the rear end gearbox? I have rebuilt several of these hyd pump / motor separated systems in the past and the O-rings can be a PITA to get right. There is a method to keep them aligned and described in the manual that you can download....look in the manuals section of Red SQ. It describes how to make studs to align the O-rings and hold them in place. Here is a pic of the studs I use. Share this post Link to post Share on other sites
tinkerer 0 #3 Posted April 7, 2015 (edited) Dave thank you for responding. The push/tow valve screw is bound tight and cannot be adjusted yet. I'm soaking it with penetrating oil but still no action. Is closing this screw adjustment a prerequisite for priming the pump?? Edited April 7, 2015 by tinkerer Share this post Link to post Share on other sites
daveoman1966 3,762 #4 Posted April 7, 2015 The PUSH valve is not related to pump priming. You said the tractor could be pushed manually and that can only be done if the PUSH valve is in the OPEN position. If it is closed, and everything else is normal, the tractor would be VERY DIFFICULT to move manually. Whats more, it should NOT be moved with the push valve closed. If you have hyd lift, break loose a fitting somewhere and see if fluid seeps out. If it does, then that's a good sign. If not, then there are further issues to investigate. 1 Share this post Link to post Share on other sites
tinkerer 0 #5 Posted April 8, 2015 (edited) I do not see any lines from the pump for hydraulic lift,only for driving the wheels. Question young man- there is a relief valve in the pump. Where is that located ? A man who works with hydraulic systems stated that this valve may need to be set to an open position to facilitate the priming process. I know there is a charge pump and the high pressure piston pump. I'm not certain that the pressure relief valve would have any influence on the charge pump function. Also,I realized last night that I failed to convey that this is the newer split pump/motor system and has the "lock lever" on the transaxle. Edited April 9, 2015 by tinkerer Share this post Link to post Share on other sites
