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I have a market 1997 Komatsu PC 75UU2. It was working fine…

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I have a gray market...
I have a gray market 1997 Komatsu PC 75UU2. It was working fine and now the boom suddenly does not want to go down. The engine lugs when I push the lever to lower the boom but it does not move. All of the other boom, stick and bucket movements work just fine. I did a visual check of everything and cannot see anything obvious. Any assistance and insight would be appreciated.
Submitted: 7 months ago.Category: Medium and Heavy Trucks
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Answered in 46 minutes by:
1/5/2018
Technician: Curtis B., Technician replied 7 months ago
Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 31,871
Experience: Technician turned service manager on multiple lines of trucks and engines, used in industry.
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Technician: Curtis B., Technician replied 7 months ago

How is the boom cylinder hoses connected to the unit? Are there any quick connections? A common problem is where a quick connect moves back, and the check valve in the connector closes, not letting fluid to flow from the cylinder.

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Customer reply replied 7 months ago
They are not quick connect. They are threaded connections and everything looks snug.
Technician: Curtis B., Technician replied 7 months ago

The cylinder is not going down because the fluid is not leaving the cylinder, the return may be plugged or hose or tube kinked.

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