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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Case 450 Crawler Hydraulic problem

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Curtis Kellar

05-19-2007 11:12:37

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I'm at whits end. I had a hydraulis hose break and ran out of fluid before I knew it had broke. The dozer stopped forward motion before I knew there was a problem. I replaced the hose and the fluid. The dozer built up pressure and I started forward. Within 50 yards I once again came to a halt. Seems that no fluid is moving now and I'm wondering if I need to prime the system somehow. I've broken almost all the connections in the system. No fluid anywhere but in the unit. What the heck do I need to do to get back in action? Thanks for any help! Curtis

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05-20-2007 10:09:28

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 Re: Case 450 Crawler Hydraulic problem in reply to Curtis Kellar, 05-19-2007 11:12:37  
My 450 Case manual says when replacing charge pump to fill inlet hose with oil or pump damage could occur. Since you have run yours out of oil the procedure to get it going again should be the same. Fill this line with oil then take note of your psi guage on your dash (if it works). The pressure should be around 225 psi. If it's way low you'll have to replace or rebuild the charge pump or hope for the best. Just to be sure you know, the charge pump is located on the right side of the engine under your alternator. Hope this helps you.

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ben brown

05-20-2007 03:59:55

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 Re: Case 450 Crawler Hydraulic problem in reply to Curtis Kellar, 05-19-2007 11:12:37  
chris. on my 450 track loader on rt side of engine is a hy charge pump that pump oil to toque converter. this well loes prime if you loes all your oil. you may need to undo line fill suction hoes. also make sure you filled the transmission with oil dip stick and fill are under seat.

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Curtis Kellar

05-20-2007 14:43:49

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 Re: Case 450 Crawler Hydraulic problem in reply to ben brown, 05-20-2007 03:59:55  
Thanks for the comments fella's. I lucked into fixing the problem last night. I dropped the belly pan and cracked the fitting going into the torque converted. I cranked the motor and it immediately primed the system. She's working perfectly again and has dug a 1/3 of a pond today. Thanks again! Curtis

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