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I have a terex 51-19s. The boom will not go down or extend…

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I have a terex 51-19s...
I have a terex 51-19s. The boom will not go down or extend out. What could be the problem?
Submitted: 5 years ago.Category: Construction and Road Equipment
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Answered in 19 minutes by:
1/22/2017
Mechanic: Curtis B., Technician replied 5 years ago
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 43,618
Experience: Technican turned service manager with multiple lines of equipment and rental units.
Verified

Hello! Let's see if we can work together and come to a satisfactory conclusion!

Sorry, I answered a question for you back in September, and question was not paid. I will opt out.

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Customer reply replied 5 years ago
Well, my credit card was charged anyway.
Mechanic: Dan, Technician replied 5 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,871
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 try to help. Test for power to the control valve solenoid for the boom down and boom extend functions on the valve block. If none check the wiring harness, fuses, relays, and the controls for proper operation. If there is power there check the control valve for problems or sticking mechanically or a failed solenoid. Let me know the results and your serial number.

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Customer reply replied 5 years ago
I do not have the serial number. I just bought the machine used, It had been sitting up. It seems to stick mostly when there is a load on the forks. Also boom out will not respond. I have hydraulic diagrams from Terex. Which solenoid go to the boom down and out and which control valves go to that function. Which lines coming out of the joystick control these movements?
Thanks for your help.
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Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,871
14,871 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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