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I just recently bought a Komatsu pc40mr-2 mini excavator…

Hello! I just recently...

Hello! I just recently bought a Komatsu pc40mr-2 mini excavator from my former boss. I've been running this machine for the last 6 yrs and its been an excellent machine. The last couple years its been losing power. We had the hydraulic pressures checked by Komatsu and they said they were where they should be. I got this machine a couple weeks ago and it really seems to have gone further down hill. When traveling it bogs the motor down and when I use multiple functions it does the same. The breakout power is pretty sad as well. Hoping for some advise on where to start toward wake this thing back up... if it can even be done? The machine has 8500 hrs.

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Construction Equipment Mechanic I'm going to connect you with knows all the tricks and shortcuts.

Sounds good!

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Answered in 1 minute by:
11/8/2020
Mechanic: Curtis B., Technician replied 2 years ago
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 43,924
Experience: Technican turned service manager with multiple lines of equipment and rental units.
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Hello! Let's see if we can work together and come to a satisfactory conclusion!

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Customer reply replied 2 years ago
Sounds good to me!
Mechanic: Curtis B., Technician replied 2 years ago

If the pressures are good, is the engine putting out the power to run the pumps at full rpm? What have you done to help the engine? New fuel and air filters? Have you blew out the outlet line from the tank to the first fuel filter?

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Customer reply replied 2 years ago
My old boss just routine maintenance on the machine... oil changes, and filters. Nothing radicalHow would one see if the engine is running at its peak?
Mechanic: Curtis B., Technician replied 2 years ago

You would need a way to measure engine rpm, a test tachometer. But I would start by changing the fuel filter and blowing out the line from the tank, by blowing back into the tank with the tank cap off, to clear any debris that collects in the outlet.

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Customer reply replied 2 years ago
I'll try that... If the hydraulic pressures have gone down since the test in the past, what would be something i would look at on that side of things? Hydraulic filter change and would it be worth changing the hydraulic fluid as well as a starting place?
Mechanic: Curtis B., Technician replied 2 years ago

Oil and filters rarely will affect pressures, more like pump would be getting weak.

Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 43,924
Experience: Technican turned service manager with multiple lines of equipment and rental units.
Verified
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Customer reply replied 2 years ago
Are there more than one pump I would be looking at? If so which?
Mechanic: Curtis B., Technician replied 2 years ago

It has only one main pump.

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Customer reply replied 2 years ago
Thank you for your help! I'll start my trouble shooting and probably be back in touch. Have a great day!
Mechanic: Curtis B., Technician replied 2 years ago

Thanks!

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