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Cat 303cr mini excavator troubleshoot

I have a cat 303 cr and under hydraulic load it's trying to stall the engine?? Hydraulic pump going out or??...any suggestions?

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Posted on Jan 02, 2017

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SOURCE: 330 excavator with a c9 cat engine, heavy SMOKE

At the time you made all the above repairs, did you replace the "throw away" turbo charger? The turbo charger commonly sucks oil, and it is not repairable.

Run it without the inner & outer air cleaner. If it isn't the turbo, run the injector cut out test. If the injectors are ok, then you need to replace the injection system hydraulic pump, which is also unrepairable.

Posted on Apr 23, 2010

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Oct 14, 2015 | Cars & Trucks

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Throwing error code 3173, even dealer didn't know. Machine idles fine, when hydraulics engage after it warms up, it dies.


not knowing what machine it is , I would suspect that the problem is in the control valve system or hydraulic pump
this is indicated by when you use something the hydraulic pump comes under considerable load and almost stalls the motor
That indicates that the pump is trying to drive 2 operations at the same time ( up/down or in/out or maybe a combination of all together ) that could be from a failed spool valve/s in the control unit or the gears in the pump are binding up from excessive wear on the shafts

Aug 30, 2015 | Cars & Trucks

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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?


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

Mar 28, 2015 | Mini Cars & Trucks

1 Answer

I have a mini excavator with a 3 cyl. isusu engine and am having a hell of a time getting it to start can u help


Have you primed the fuel system? If this eng has hydraulic injectors loosen the tube from the injector pump at the injector and crank untill fuel with no air bubbles comes out. Be careful as the fuel is under extremely high pressure. Do NOT unscrew the fitting completely.

Mar 02, 2015 | Mini Cars & Trucks

1 Answer

What causes a mini excavator (Yanmar B27) on rubber tracks to shudder and shake ( bunny hops) when first moving forward or reverse? Would worn track rollers produce this effect? Thx


probably not--This sounds like uneven pressure from the hydraulic pump or problems with the drive motors. Check that the hydraulic oil filter is in good condition (not blocked) and have the pressure in the hydraulics checked.. Have the hydraulic controls checked for correct operation. (if electric controls check for voltage problems to the solenoids and if manual check for control valve problems)

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Evacuate the hydraulic tank and clean with kerosene.Get as much fluid out of the machine as possible. Replace Filters and if it builds back up with metal SELL SELL SELL it or your in for some big money repairs.

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Warning light on in cab 235 c cat excavator


have you checked the level could be low or change the hydraulic filters they could be blocked. or it is just a service light.

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2 Answers

330 excavator with a c9 cat engine, heavy SMOKE


Why did you do all of the engine work? Due to the same problem? Have you ran an ET on it to check for codes ?

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Possible problem of slow movement of Hydraulic cylinder and Travel of Komatsu excavator


hi, have u checked ur fluid and filter, if so u need to check the pressure.
u can buy a normal guage and and get a bit of pipe made up to suit ur job.
you might be able to get away by increasing the spool valve. but if ran low on hydraulic then it is a new pump.

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