Construction and Road Equipment

Construction and road equipment repair questions? Ask a mechanic ASAP

Connect one-on-one with {0} who will answer your question

This answer was rated:

Cat masterech this is for you 330C DKY01249 i have a few?

Cat masterech this is for...
Cat masterech this is for you 330C DKY01249 i have a few ? regurading functions and so on . Boom rasies very slow same with bucket and stick also tracking . no codes on HYD Side or the C9 side filters are all new SOS is good i do have the suction line is n good also haveing a problem with the return filtrt housing there is oil up at the top i resealed the shell with the service kit someone before this landed in my lap was in there . also mainreleaf is to spec4950 psi and boom bucket is to spec to.
Show More
Show Less
Ask Your Own Construction and Road Equipment Question
Answered in 2 hours by:
5/16/2017
Mechanic: catmastertech, Technician replied 5 years ago
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 3,996
Experience: Field service technician for CAT 19 years.
Verified

I just got in and I saw your post on the old question.

Does the engine stall or become weak under load?

Is the hydraulic temperature high?

Have you tested pilot pressures?

Do you know how to perform the sweep test on the PRV solenoid?

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
Oil temp is good Eng does not stall an speed is good No i have not tested pilet press . PRV sweep test is that doen ethew ET
Mechanic: catmastertech, Technician replied 5 years ago

It can be done in ET or through the monitor. You will need a gauge to watch the PRV pressure while performing the test too.

Check pilot pressure first as it is the source for the PRV powershift pressure.

No DERATE or logged events codes?

How is the engine atmospheric pressure sensor working? (should be near 15 psi at sea level)

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
no derate codes at all yes atmos is good i stock all the sensores for the Cp on my TRK lolnothing loogedalso suction line is NG its sucking Air also The return filter shell maybe NG i took the cover off and ther was alot of oill up there i have never seen that beforepilet press i will check slow moveing may be a flow problem if pilt is low and not shifting the spooll all the way
Mechanic: catmastertech, Technician replied 5 years ago

I have recently had issues with a low reading atmospheric sensor that caused low power and had two 330D models that keep showing high exhaust temperatures due to harness and sensor problems. The engine pressure sensor harness is very cheap (for CAT) and I would recommend replacing it if you find any strange readings on the pressure sensors.

Definitely, fix the suction hose, aerated oil will make the machine weak. The filter housing could be leaking but, I have also found PM techs not removing the canister and just popping off the top in the housing. This will cause the oil to overflow when they install a new filter and fill the housing with oil.

If the filter and oil are clean, put a vacuum on the tank then open the filter canister and pull all the oil out of it. Install the cap then twist out the canister to clean the housing. (Less oil to deal with.)

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
i removed the enitie can and resealed I always do and keep the kits on the trk. after I diid that I rand the unit and desided to take a look and took of cover and there was oil ageiI always put a vac trans duscer on hyd tank
Mechanic: catmastertech, Technician replied 5 years ago

Ok, sounds like you are on top of it.

If you do not find any issues when testing, download a product status report and upload it here so I can see the rest of the machine operations.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
ok I will but back to atomisphiric press sensor have you seen them act up with out setting off an code ?
and is a config for and elevation setting I think ther is correct me if I am wrong
Mechanic: catmastertech, Technician replied 5 years ago

The atmospheric sensor is the altitude setting and yes it is common for one to stop working and not set a code. The ECM will see a value that is in the normal range and think it is ok. Watch it change as the engine warms (you may only see a tenth of a pound change) or just connect a new one to the harness and leave it open to the air. I have seen some plugged with dirt too. it is recommended you never apply air pressure to one as it is easily damaged.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
all of the above has checked out ok I am stumped
Mechanic: catmastertech, Technician replied 5 years ago

Did you download a product status report?

Did you the sweep test vary the pressures the same as the gauge was showing? (Value shown on display is only a calculation, no pressure sensor is reporting this value.)

If you hold the bucket close during the sweep test, could the engine carry the full load or did it stall during the sweep test?

Have you tried calibration the PRV?

Have you tried removing the Negative Flow line from the pump control to see if it would effect the operation?

Does this machine always perform like this or does it happen randomly after hours of operating?

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
The prv is calabrated and suucsefull which You do nor do phone calls Right
Mechanic: catmastertech, Technician replied 5 years ago

Sorry, I am not setup for phone calls.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
today we ran and at one point it did perform correctly . i noitced if i start out with the eng speed at ^ and move up to 1o every thing works perfect . but now i have a bigger problem i changed the suction line and while it was i had the elbow off the pump tp clean it and replace the oring when i reinstalled it and followed the air purge proceadure i left a f**king rag in the tube and the pump chewed it up and no i dont no what to do and i lost one track
Mechanic: catmastertech, Technician replied 5 years ago

It sounds like you may have an issue with the return flow check valve or oil cooler bypass valve. One could be causing a restriction back to the tank, slowing the system down.

I have seen some return flow check valves fail.

As for the rag issue, the pump may survive the rag but, it would be best to have it rebuilt. No way to tell how much might get into the control head and servos.

Same with the main control valve, it may be contained in the travel sections and straight travel valve as that is where the oil enters the main control valve. Since the valve has a parallel passage, the rag could make it to any valve section.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
Is it possible for a biepassing cyl cause the symptoms ?
Mechanic: catmastertech, Technician replied 5 years ago

It would only slow that one circuit and you would have a drifting issue with that circuit as well.

It would not cause any other control to slow.

Low pilot pressure would slow the machine but, the joysticks would feel sluggish.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
Return flow ck valve is the the one on the return filter houseing ?
Mechanic: catmastertech, Technician replied 5 years ago

The return flow check valve is attached to the outlet of the main control valve. The line then goes toward the oil cooler but, passes through the oil cooler bypass valve first then into the oil cooler. Once the flow exits the cooler or bypass, it then flows to the return filter and into the tank.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
If there was a restriction the hyd oilb would be getting hot correct ?
Mechanic: catmastertech, Technician replied 5 years ago

Yes, if they continue to use the machine at high speed, the oil would get hot.

If they are reducing engine speed or stopping the machine often, they might not heat the oil as much.

The failure of the check valve on one machine was due to it coming apart. The other failure I saw was a rag stuck in the valve causing it to stick.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
Now are you associating check valve and cooler bypass valve with my original issue or just my rookie mistake with the rag ?
Mechanic: catmastertech, Technician replied 5 years ago
No, I'm just saying it is a possibility. I was told the rag got in the other machine when the radiator was removed for repairs.
Is it possible someone else worked on this machine in the past?
Think about the timeline this issue began, did some other problem effect the operation? We're any changes made to the machine before this trouble started?
Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
The left track and swing share a pump correct ?
Mechanic: catmastertech, Technician replied 5 years ago
left track, stick and swing. Then right track, boom, bucket and auxiliary are on the other pump.
Of course stick and boom have special shared circuits to provide flow from both pumps. (Stick II spool and Boom II spool.)
Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
Do you think peaces of the rag made to the left travel moter and the swing moter ?I did find some smaller peaces in the return filter . So i will also need to check cooler Bipass and return ck valve . Now keep in mind the pumpdid not get the entire rag its a white cotton rag 20×20 i would say 6x6 peace got in based on what i removed from suction port.
Mechanic: catmastertech, Technician replied 5 years ago
I doubt the travel motor would have anything in it unless the machine was moved. I assumed as soon as the rag was remembered, you shutdown the machine. The swing motor is more likely to have some in it. As you know, the options are to fix anything that acts up later or rebuild everything.
CAT says even a single piece of rag fiber can cause issues and they recommended dealers use paper towels over cloth.
I am still not sure about the cause of the original failure.
Did one side track different before? Or were both sides slow? What are the cycle times of the implements?
Ask Your Own Construction and Road Equipment Question
Customer reply replied 5 years ago
Two thing i would like to keep this Qust open until i get the pump back and in the macine . alos came you give me a quick over veiw on what a wiggle test is and how to interpet the finding s
Mechanic: catmastertech, Technician replied 5 years ago

I have no problem with that but, the site might let the question go dead if no responses are seen in a few days.

A wiggle test is useful to locate intermittent connections. Once you find the group with the sensor or circuit you want to test, start the test and place your speaker volume on high. I even use an external speaker when the area is loud. If you wiggle the wires and the value changes, the alarm will sound. Restart the test to pinpoint the exact location or connector that is causing the intermittent issue.

catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 3,996
Experience: Field service technician for CAT 19 years.
Verified
catmastertech and 87 other Construction and Road Equipment Specialists are ready to help you
Ask your own question now
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask catmastertech Your Own Question
catmastertech
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 3,996
3,996 Satisfied Customers
Experience: Field service technician for CAT 19 years.

catmastertech is online now

Related Construction and Road Equipment Questions
I have a HR18 excavator all functions work right except it
I have a HR18 excavator all functions work right except it seams to track slow when youl lift boom or extend jib or curl bucket.it tracks faster! whats going on. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
Cat cjc01592. Rh track slower in reverse than lh track when
Cat cjc01592. Rh track slower in reverse than lh track when you boom all way up it makes tracks same speed … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
Cat 424D Tlb when you load front bucket n lift go slow when
Cat 424D Tlb when you load front bucket n lift go slow when u rev high just stop. … read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
Cat 330 boom/bucket operates very slowly. Travel operates
cat 330 boom/bucket operates very slowly. Travel operates very slowly. Stick and swing function normally. Pilot pressure at spec right at 600psi. What would be the common denominator to the travel cir… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
My mini excavator acts like it has a restriction in
my mini excavator acts like it has a restriction in hydraulic circuit … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
I have a hitachi ex270lc my problem is the hyds cut out on
i have a hitachi ex270lc my problem is the hyds cut out on right track but will work if i crowd bucket. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
Catmastertech, have cat 315cl serial number cacjc02070 with
Catmastertech, have cat 315cl serial number cacjc02070 with 3646 hours, Have Electronic Technician and pressure gauges to trouble shoot per your instructions, have pump howl in left travel function in… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
3,996 satisfied customers
I have a cat 307ssy tracks slow without much power I have
I have a cat 307ssy tracks slow without much power I have new final drives not much better now can I adjust the HyD pump pressure… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
I have a link belt 3400q that stalls when the bucket is
I have a link belt 3400q that stalls when the bucket is opened or closed … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
I have a Catapillar 320BL the hydraulic functions are losing
I have a Catapillar 320BL the hydraulic functions are losing power boom up is extremely slow and tracking seems to have lost a lot of power as well The pilot pressure is at 600 psi I tested the two po… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
3,996 satisfied customers
Working on a deere 330LC Problem is with tracking. Right
Working on a john deere 330LC Problem is with tracking. Right track runs much slower and with lest power then left. Power jumps up on right track when stick function is activated while travelling.… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
Link belt ls1600CII. The main problem in having is when the
Link belt ls1600CII. The main problem in having is when the boom is lifted, its slow and bogs the engine down unless you bottom out the arm function at the same time, then the boom shoots right up. Ev… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
I have a 1982 tachi excavator model UH02 it has steel
I have a 1982 Hitachi excavator model UH02 it has steel tracks, it runs well and moves well on tracks, but after about 6 are 7 hours working it s real slow when trying to move but the rest of it still… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
Where would I check shavings after I replaced final drive on
Where would I check for metal shavings after I replaced final drive on left side Bucket will not raise and left track is binding because it's not getting fluid… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
3,996 satisfied customers
I have a Komatsu PC50MR-2 with some hydraulic issues. The first
I have a Komatsu PC50MR-2 with some hydraulic issues. The first issue is that the boom raise function is immediately overridden when any other function is initiated at the same time (ie. Crowd or Curl… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
I have a 2002 Cat 312b tracks move very slow in the forward
I have a 2002 Cat 312b tracks move very slow in the forward direction they do move a little bit faster if you dead head the bucket.… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
3,996 satisfied customers
Hello, we have a Caterpillar 311b with some hydraulic issues,
Hello, we have a Caterpillar 311b with some hydraulic issues, here are the symptoms- with travel just slightly engaged(direction doesn't matter, same symptoms forwards or reverse), machine not moving,… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,215 satisfied customers
I have a 1980 235 Cat excavator and recently the stick is very
I have a 1980 235 Cat excavator and recently the stick is very slow, also one track has lost power. I checked the pressure on the pumps, both pressure up to 3700 psi, pilot pressure is at 325 at the s… read more
catmastertech
catmastertech
Technician
Vocational, Technical or Trade Scho
3,996 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

2,324 satisfied customers

Technican turned service manager with multiple lines of equipment and rental units.

Wayne

Wayne

Journeyman

1,298 satisfied customers

worked on many road graders, Bull dozers , skid steers, Rollers

Cat Man

Cat Man

Cat Engine Expert

578 satisfied customers

I am ASE Master Certified.

dieseldan55

dieseldan55

Mechanic

299 satisfied customers

Road Mechanic for Volvo Construction Equipment.

Chris (aka- Moose)

Chris (aka- Moose)

Technician

85 satisfied customers

24 years of experience diagnosing & repairing

Steve

Steve

Mechanic

42 satisfied customers

Heavy Equipment Mechanic for 25 years

JBFixxer

JBFixxer

Mechanic

22 satisfied customers

16+ years experience, hydraulics,hydrostatics, engines, fuel injection systems. And everything in between.

< Previous | Next >

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x