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I have a 844C-42 Highlander Lull, the boom moves very slow…

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I have a 844C-42 Highlander...
I have a 844C-42 Highlander Lull, the boom moves very slow to scope out and retract in as well as the frame tilt isn't working.
Submitted: 3 years ago.Category: Construction and Road Equipment
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Answered in 55 minutes by:
8/13/2019
Mechanic: Dan, Technician replied 3 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,105
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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Hi, My name is***** will be glad to help. We can follow up as needed on here, Give me some time to review your information and follow up with my responses. Professionals are not employees of the site but users of the site and help on here as time allows in between jobs, family, etc. Response time can vary depending on my work load each day but I will always respond back on my next available login. Feel free to respond back at anytime if for any reason we seem to get separated, for status, etc.

What is your serial number?

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Mechanic: Dan, Technician replied 3 years ago

Take a close look at the hydraulic oil and filter for any signs of fine metal or debris that would flag a potential pump or component failure occurring. Check the filter internally to inspect a sample. If clean, take a close look at the control valve and relief valve cartridges for any damaged O-rings or other debris that would cause either to malfunction. I recommend having your pressures tested and confirmed whether or not they are within factory specifications. It is a pleasure to help anyway I can.

Be sure to also check control valve spool and relief valve cartridges for any scoring on the machined surfaces that would cause them to stick. Check for free movement as well as any other damage.

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Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,105
15,105 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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