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I have a Hitachi EX -450-LC. I put a new hydraulic pump on…

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I have a Hitachi...
I have a Hitachi EX -450-LC. I put a new hydraulic pump on it and the controls move slow. In order for it to swing you have to work the boom or bucket function . The bucket moves at a snail s pace. Help!!!
Submitted: 7 years ago.Category: Construction and Road Equipment
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Answered in 1 hour by:
6/27/2015
Mechanic: Dan, Technician replied 7 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,874
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified
Hi my name is***** will be glad to help. First was the system cleaned out from the pump failure. Metal through the system can cause further damage to system components and the new pump. It will stuff the valves and cause them to stick, cause scoring to the machined surfaces, seals, etc. Check your relief cartridges and main control valve spools for signs of metal/debris, damaged o rings and sticking causing a bypass of pressure. Checvk your in tank return folter for signs of fine metal and flush the system completely if there is metal still in the system. Let me know
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Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,874
14,874 Satisfied Customers
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.

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