Post by Ronmar on Jan 31, 2008 22:28:53 GMT -5
Along the lines that a clean hydraulic system is a happy hydraulic system, I made this addon hydraulic maintenance filter. This is applicable to all jinma's(or any tractor for that matter) with rear supply and return ports. The total cost was under $45.
The parts required are a set of Quick Connect fittings, a hose long enough to loop back to the return and a filter boss and cartrige assembly. I chose this zinga model usually carried at Surplus center. It has 3/8" threaded ports and is rated at 10 micron filtration and up to 7GPM of flow. The base with one cartridge cost about $14 with replacement cartriges around $5. the filter cartrige has a bypass that opens at 18 PSI. It is a pretty simple assembly if you pay attention to the flow arrow on the filter boss.
I call it a maintenance filter because in the case of the Jinma, the 3PH operation must be disabled to force fluid to the rear supply port. I close the speed regulating valve under the front of the seat, then I connect the filter assembly to the ports. I add a tywrap to the return line QC from the filter so that it cannot be inadvertently removed. Then I place the 3PH control lever in the raise position which sends all the system hydraulic flow thru the filter. It is important that the return line from the filter not be disconnected while pressure is applied as this would cause the filter cartridge to rupture.
You might note in the photo that my return port is part of the filler/vent cap. Because of my terrain, I had issues with spilling hydraulic oil out the vent while working up on slopes. One of the first modifications I made to my tractor was to drill and tap a new 1/4" NPT vent port between the rear seat mount bolt holes. This moved the vent closer to the center of the resovoir, so no more oil burps down the back of the tractor. On the new vent I installed a homemade dessicant breather filter. I am about to make some changes to that installation so I will post some more detail on that when I have it finished
Once the new vent was in, I had to plug the cap vent, so I thought what better way than to weld on a street elbow and put a hydraulic return port there. I had to give up my dipstick for this, but if I can't look into the hole and see how much fluid is in the resovoir, my eyesight is probably so bad that I shouldn't be operating the tractor:)
Ron
The parts required are a set of Quick Connect fittings, a hose long enough to loop back to the return and a filter boss and cartrige assembly. I chose this zinga model usually carried at Surplus center. It has 3/8" threaded ports and is rated at 10 micron filtration and up to 7GPM of flow. The base with one cartridge cost about $14 with replacement cartriges around $5. the filter cartrige has a bypass that opens at 18 PSI. It is a pretty simple assembly if you pay attention to the flow arrow on the filter boss.
I call it a maintenance filter because in the case of the Jinma, the 3PH operation must be disabled to force fluid to the rear supply port. I close the speed regulating valve under the front of the seat, then I connect the filter assembly to the ports. I add a tywrap to the return line QC from the filter so that it cannot be inadvertently removed. Then I place the 3PH control lever in the raise position which sends all the system hydraulic flow thru the filter. It is important that the return line from the filter not be disconnected while pressure is applied as this would cause the filter cartridge to rupture.
You might note in the photo that my return port is part of the filler/vent cap. Because of my terrain, I had issues with spilling hydraulic oil out the vent while working up on slopes. One of the first modifications I made to my tractor was to drill and tap a new 1/4" NPT vent port between the rear seat mount bolt holes. This moved the vent closer to the center of the resovoir, so no more oil burps down the back of the tractor. On the new vent I installed a homemade dessicant breather filter. I am about to make some changes to that installation so I will post some more detail on that when I have it finished
Once the new vent was in, I had to plug the cap vent, so I thought what better way than to weld on a street elbow and put a hydraulic return port there. I had to give up my dipstick for this, but if I can't look into the hole and see how much fluid is in the resovoir, my eyesight is probably so bad that I shouldn't be operating the tractor:)
Ron
I'm glad they don't need replacing too often 