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Is there an adjustment to increase hydraulic power on Komatsu pc35mr-2 mini excavator? Or is there a sensor that is responsible for relationship between engine rpm and hydraulic operation?

Starts fine. When throttle is at lowest RPM - nothing functions. When I push throttle half way - it becomes operable, but still low on power. On full throttle, at highest rpm the machine functions fine. My concern is that it should function at any rpm, or at lowest at least something should move, but nothing does. Please help if you have any idea.

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You assumption is right
the pump is operating at idle as at full rpms and is controlled by pressure relief valves
When demand for pressure is low the valves will be partially opened and will operate when the pressure is reduced ( ram valve is moved)
Higher rpms maintain the pressure for faster ram operation
I would suggest that you have the system pressure tested by a service centre as it could be a malfunctioning valve (solenoid) or a failing pump

Posted on Mar 28, 2015

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Posted on Jan 02, 2017

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Komatsu Fault Codes


E02 PC-the EPC system;
E03, Swing parking brake system;
E10, the engine controller power failure, the engine control drive system circuit malfunction (this engine stall;
E11, the engine control system failure (decrease of output power, in order to protect the engine);
E14, the feedback system abnormalities;
E15, engine sensors (temperature, fuel pressure, oil pressure) fault;
EOE, a network failure.
The fault code: the 989L00 the engine controller lock warning (mode 1).
989M00, the engine controller to lock warning (mode 2).
989N00, the engine controller to lock warning (mode 3).
AA10NX air filter clogging.
AB00KE charging voltage is too low.
B @ BAZG, low oil pressure.
B @ BAZK, the oil level is too low.
B @ BCNS, engine coolant overheating.
The @ B BCZK the coolant level is too low.
B @ the HANS, the hydraulic oil from overheating.
CA111, the engine controller internal fault.
CA115, the engine speed sensor and backup speed sensor failure.
CA122, the intake air pressure sensor feedback voltage is too high failure.
CA123, the intake air pressure sensor feedback voltage is too low failure.
CA131, the throttle plate sensor feedback voltage failure.
CA132 throttle plate sensor feedback voltage and low failure.
CA144, high coolant temperature sensor feedback voltage fault 145, the coolant temperature sensor feedback voltage is too low failure;
CA153, intake air temperature sensor feedback voltage is too high failure;
CA154, intake air temperature sensor feedback voltage is too low failure;
CA155, the intake air temperature is too high (over limit);
CA187, sensor power supply voltage is too high failure;

More Fault Codes HERE http://truckmanual.weebly.com/komatsu-fault-codes.html

on Dec 20, 2016 | Cars & Trucks

1 Answer

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possibly not the sensor but the hydraulic adjuster that controls the cam timing
the cam sensor reports the cam position in relation to engine rpms and the ECM adjusts the cam position by the hydraulic servo / solenoid to the preset cam position for that rpms
I suspect that the problem will be in that servo / solenoid

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Bobcat 331 Mini Excavator, Front Idler Assembly

www.loaderpartssource.com/bobcat-331-mini-excavator-front-idler-asse...
Loader Parts Source, Inc. offers this Front Idler Assembly for Rubber Tracks (W/ Holes in idler) for replacement on the Bobcat 331 Mini Excavator. Serial Number ...
Bobcat Idler: Construction Equip Parts ' eBaywww.ebay.com/bhp/bobcat-idlereBayBobcat 325, 328, 331, and 334 Front Idler - Undercarriage, Mini Excavator, ... BobcatT140 T180 T190 T200 T250 T300 T320 T650 T630 T750 864 Front Idler ...Undercarriage Parts Can Help You:Eliminate Unwanted Machine Downtime.Front/Rear Idlers - Mini Excavator Partswww.miniexcavatorparts.com/productcart/pc/viewCategories.asp?...14Aftermarket front and rear idlers are available for Bobcat track loader and mini excavators, Kubota miini excavators, and ... Aftermarket Bobcat® Front Idler - Bobcat CTL ... Aftermarket Idler - Bobcat 325 328 331 334 430 335.

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Undertaking that major a project, even on a "small" machine like a mini-excavator, should be done using an authorized service manual. I suspect with all of the hydraulics and other mechanicals you really want to be sure of what you're doing. If you're looking for a free service manual, I can't help except to say to consult your local dealer. An online source I found for a manual, albeit for a fee, is found here:
http://www.gciron.com/IHI_Parts_35NX_Service_Manual_Service_Manual_35NX_p/35nx%20service%20manual.htm

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