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    Need a Service Manual Source for a Volvo EC140CL Excavator

    You can call your dealer to see if they can or will order you a manual but most of the service information is online and requires a subscription. The sensors should be located at the servo manifold by the MCV and should be labeled.
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    Need a Service Manual Source for a Volvo EC140CL Excavator

    Both of those codes are for voltage above b4.88v on the signal wire for each sensor. Usually indicates an open wire from the sensor to the VECU on the signal or ground circuits. Being those sensors do not share a ground I suspect the issue is the signal circuits. I suspect that your repair to...
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    Volvo 720b

    When turning the right side wheels does the driveshaft to the differential turn?
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    Volvo ecr48 main boom down pressure only 500psi

    That is not what I was asking. Does it lower quickly? Boom down cycle time is 1.8 sec. This will tell you if you spool is moving enough. If measuring servo pressure to the boom spool the best place to do so is at the out let of the pattern change valve. Those valves have been known to leak...
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    Volvo ecr48 main boom down pressure only 500psi

    If you push the joystick forward all the way does it drop quickly or does it slowly lower?
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    Volvo ecr48 main boom down pressure only 500psi

    Does the boom drop quickly when you lower it? Is this the port relief you swapped top to bottom? The arrow just shows the very top of it behind that hose.
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    Volvo ecr48 main boom down pressure only 500psi

    I am still hedging that the port relief is causing your issue. To rule out the servo side of things swap the pattern change and see if the issue moves to the arm or stays with the boom.
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    Volvo ecr48 main boom down pressure only 500psi

    This is a LUDV LS system. This is not a "CAT" system or made by Danfoss. It should be Bosch as far I know. I would have to see what Cat is using on their TLB's now. The last one I worked on was 20yrs ag when I worked for the regional Cat dealer. Back then they called them resolvers.
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    Volvo ecr48 main boom down pressure only 500psi

    Not 100% certain of your terminology.
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    Volvo ecr48 main boom down pressure only 500psi

    Standby pressure should be appr 310-335psi and there are no LS shuttles or check valves. That function is accomplished by the compensators in each spool section. I had already asked him if he had swapped the port reliefs. If you look at his question before that post he asked if there were any...
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    Volvo ecr48 main boom down pressure only 500psi

    Are you checking pressure at the yellow arrow or the red arrow?
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    Volvo ecr88d ,needing some help

    You need to be much more specific with your complaint if you want help.
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    Volvo ecr48 - feels like swing brake is applied - help!

    Maybe it's time you called your dealer
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    Volvo ecr48 main boom down pressure only 500psi

    And you got 3500 PSI at the servo cap for boom up?
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    IR SD70D issues

    As stated the drove motors are plumbed in parallel. Once one spins out you are done, just like an open differential. There was an option for electronic anti spin control. That did help some but is limited in its capabilities and has its issues. If you have that you will have speed sensors at the...
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    Volvo ecr48 main boom down pressure only 500psi

    Not that would affect only the boom down circuit. The only reliefs are the circuit reliefs and the LS limiting valve, which affect all functions. When you say you "checked the pressure at the top and bottom of the spool with in-line gauges", do you mean at the hoses to the boom cylinder or the...
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    Volvo ecr48 - feels like swing brake is applied - help!

    The 5v feed is a protected circuit. The only fuse is the one that feeds the ignition and VECU circuit.
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    Volvo ecr48 main boom down pressure only 500psi

    Where are you measuring your pressure? The only thing in the circuit from the spool to the boom rod end port is the port relief. Does this happen with the pattern change valve switched? Is the pattern change valve all the way in one position or the other?
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    Volvo ecr48 - feels like swing brake is applied - help!

    Did you try to jumper the wires at the pressure sensor? This should cause the brake to release. The thumb should not have anything to do with the swing brake as afar as I know. Does the brake release when you use the boom swing as well?
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    Injector sleeves on Volvo L120H

    Sorry this was the section I was referring to. I did not delete the section that was correct Valve clearance, cold engine Inlet 0.4 ±0.05 mm (0.015 ±0.0019 in) Exhaust 0.5 ±0.05 mm (0.019 ±0.0019 in) Lock nuts, inlet and exhaust valve 33 +11 Nm (24 +8 lbf ft)
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