Cat 312 2007 cl hydraulic

[Hexa14]

hi everyone. i speak little english. cat 312 lc 2007 mitsubishi engine intercooler. the excavator is very weak in all hydraulic functions. on a hard gravel yard you can't turn the machine, you have to help with the boom all the time when you want to steer. you can't drive with the drive pedals, for example on a gravel road if you have to make a turn. and the machine doesn't go up a hill you always have to pullwith the boom as an aid. also the upper carriage is ineficient, the boom and others. it's hard to dig a ditch, the power runs out immediately from the hydraulics, theengine itself can turn. the engine is working. ecm fault code 69:110-10 engine water temperature? D put a new sensor fault code was still active. can this fault code cause the machine to be inefficient? does the machine go into fault mode due to a fault in the temperature sensor and not give power to the hydraulics? im from finland myself and there's a lot of stuff about excavators here on the forum.

 

[Simon C]

Best post your serial number and a picture of your dash with any lights like yellow or red flashing. Is there any active codes. Have you done all the fuel maintenance and other maintenance including filters.
Is your rad partially plugged, is the fan belt tight, how many hours on the unit. do you have access to Cat ET to check some stuff out?
Simon C

 

[Universal Parts]

It doesn't appear to be a single weak movement, but rather a weakness in the entire vehicle's movement. Possible causes include: 1. Damage to the hydraulic pump coupling causing weak movement; 2. Severe wear and tear on the pump core components (pump body, distributor plate, plunger) due to prolonged use.

 

[HarleyHappy]

Check the air filter and change your fuel filters first.

 

[Hexa14]

active code 69:1161-03.
I unplugged both pump delivery pressure sensors to compare them, and measured the signal wires from the harness side with the key ON:

• Pump 1 (active code) signal wire has 22 Volts.
• Pump 2 signal wire has 4.8 Volts.

Why is Pump 1 signal voltage so high? Could a short circuit or chaffed wiring harness cause 24V battery system voltage to leak into the 5V signal wire?



Cat product number *CAT03120KDBN00965* mode number 312c mitsubishi 67kw engine.

active fault codes (69:1161- 03) and (69-110-10) engine temp is ok. radiator has been cleaned and washec well and fan belts are new and tight. l will have the machine serviced on Friday all filters and engine oil changed. excavator runs better when cold but not realy wel. |' wil post some pictures if l can. l dont have a proper fault code reader.

 

[Nige]

Is it possible to interchange the pump pressure sensors between pumps 1 & 2 to see if the fault follows the sensor or remains on Pump 1.?

BTW you do not need a Code reader. Codes can be read perfectly from the Operator Monitor screen.

Check your message inbox.

 

[stephenrobinson98741]

hi everyone. i speak little english. cat 312 lc 2007 mitsubishi engine intercooler. the excavator is very weak in all hydraulic functions. on a hard gravel yard you can't turn the machine, you have to help with the boom all the time when you want to steer. you can't drive with the drive pedals, for example on a gravel road if you have to make a turn. and the machine doesn't go up a hill you always have to pullwith the boom as an aid. also the upper carriage is ineficient, the boom and others. it's hard to dig a ditch, the power runs out immediately from the hydraulics, theengine itself can turn. the engine is working. ecm fault code 69:110-10 engine water temperature? D put a new sensor fault code was still active. can this fault code cause the machine to be inefficient? does the machine go into fault mode due to a fault in the temperature sensor and not give power to the hydraulics? im from finland myself and there's a lot of stuff about excavators here on the forum.

I don't think the temp sensor code alone would make the whole hydraulic system that weak. If the engine is still revving normally and not derating, I'd be looking more at hydraulic issues first—main pump, pump control, low pilot pressure, relief valve, or possibly an engine-to-pump power mismatch. The fact that travel, swing, and digging are all weak points more toward a hydraulic problem than just a coolant temp sensor fault. Have you checked hydraulic pressures yet?

 

[John C.]

You can check all the electrical from the monitor panel. The video below shows the entry procedure to access the diagnostics.

 

[Hexa14]

Is it possible to interchange the pump pressure sensors between pumps 1 & 2 to see if the fault follows the sensor or remains on Pump 1.?

BTW you do not need a Code reader. Codes can be read perfectly from the Operator Monitor screen.

Check your message inbox.

1 swapped the pump pressure sensors, no effect on the fault code. The electrical connector for pump 1 has 22 volts of signal power and pump 2 has 4.8 volts of signal power. Should pumps 1 and 2 have the same signal power when l turn the ignition key to the or position?
yeah 1 noticed when l was examining the excavator that l don't need a fault code reader.

 

[Hexa14]

You can check all the electrical from the monitor panel. The video below shows the entry procedure to access the diagnostics.

Thanks, I also found that video on YouTube. The dashboard display shows faults and other necessary information.

 

[SteinarN]

Do you have 22V on the signal wire on the excavator side when you unplug the pressure sensor? If so then you have a short somewhere putting 22V into your signal wire or the control box which the signal wire goes to is faulty and putting out 22V into the signal wire instead of reading the signal voltage.

 

[Nige]

Do you have 22V on the signal wire on the excavator side when you unplug the pressure sensor? If so then you have a short somewhere putting 22V into your signal wire or the control box which the signal wire goes to is faulty and putting out 22V into the signal wire instead of reading the signal voltage.

I can go one better than that. The 3-pin connector for the sensor is a Deutsch DT type which are easy to de-pin. Unplug the connector and de-pin the signal wire (white in colour I think) at the sensor side, then re-connect the two halves of the connector. When the key is turned on it should then be possible to separately measure the voltage on the signal wire coming from the sensor and additionally measure whatever voltage may be present on the signal wire coming from the Engine/Pump Controller side which may be pull-up voltage (around 5v) but I am not 100% certain of that.