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Setting pressure relief valve on my 853
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<blockquote data-quote="skidsteer.ca" data-source="post: 6298" data-attributes="member: 307"><p>Perry</p><p>First you need to check your pressure the setting may be fine. Hook your guage to the quick couplers on the front of the machine and activate the aux hyd flow in the intermittant mode for operating cylinders.</p><p>Run the machine for 20 minutes or so to warm the oil then put the presuure to your guage using the thumb switch at see what the reading is.</p><p>I check the book, pressure should be 2700 to 2750 psi</p><p>Adjusting screw is on the operators right rear of the main hyd control valve. Believe a 9/16" wrench fits the locknut, remove it and turning the stud that nut was threaded over clockwise will raise the pressure.</p><p>Low pressure at a idle is a sign of a pump thats getting a little worn. If you get max press at idle your pump is excellent.</p><p>Its common for the spring in the main relief valve to get a little weak over time and the pressure to get a few hundred pounds low.</p><p>However sometimes people crank the pressure up to get more power. The least pressure you can put up with and still have a functioning machine will provide the longest component life.</p><p>Example</p><p>My 553 calls for 1600 psi, When I got it it would nearly stall when it hit the end of a cylinder, checking the pressure revealed someone had miss adjusted it to 3000psi, Its a wonder the pump did not split. No wonder the engine was lugging down</p><p>I spoke with a local Bobcat tech and they set theirs 400 over the book at 2000 psi to get a little more power. The motor handles the 2000 psi setting much better. Bit bobcat likely tested and found the pumps lasted better at 1600 psi</p><p>Often people will reset the pressure do to a low reading, then in 100 hrs or so they find that no longer is helping. The pump is the real culprit, was all along,its just worn worse now. So they install a new pump and the pressure skyrockets because they never back the relieve valve setting back out. Now they have a split new pump or other damage.</p><p>Just food for though</p><p>Ken</p></blockquote><p></p>
[QUOTE="skidsteer.ca, post: 6298, member: 307"] Perry First you need to check your pressure the setting may be fine. Hook your guage to the quick couplers on the front of the machine and activate the aux hyd flow in the intermittant mode for operating cylinders. Run the machine for 20 minutes or so to warm the oil then put the presuure to your guage using the thumb switch at see what the reading is. I check the book, pressure should be 2700 to 2750 psi Adjusting screw is on the operators right rear of the main hyd control valve. Believe a 9/16“ wrench fits the locknut, remove it and turning the stud that nut was threaded over clockwise will raise the pressure. Low pressure at a idle is a sign of a pump thats getting a little worn. If you get max press at idle your pump is excellent. Its common for the spring in the main relief valve to get a little weak over time and the pressure to get a few hundred pounds low. However sometimes people crank the pressure up to get more power. The least pressure you can put up with and still have a functioning machine will provide the longest component life. Example My 553 calls for 1600 psi, When I got it it would nearly stall when it hit the end of a cylinder, checking the pressure revealed someone had miss adjusted it to 3000psi, Its a wonder the pump did not split. No wonder the engine was lugging down I spoke with a local Bobcat tech and they set theirs 400 over the book at 2000 psi to get a little more power. The motor handles the 2000 psi setting much better. Bit bobcat likely tested and found the pumps lasted better at 1600 psi Often people will reset the pressure do to a low reading, then in 100 hrs or so they find that no longer is helping. The pump is the real culprit, was all along,its just worn worse now. So they install a new pump and the pressure skyrockets because they never back the relieve valve setting back out. Now they have a split new pump or other damage. Just food for though Ken [/QUOTE]
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Setting pressure relief valve on my 853
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