funwithfuel
Senior Member
Sounds about right. If you hold bucket curl and press your power man button, you should gain about 500 psi.
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2008 volvo ec140cl slow right track and bucket curl
- Thread starter ROPecht
- Start date
ROPecht
Active Member
ROPecht
Active Member
I loose a few psi on bucket curl when I hit the strong man button.
ROPecht
Active Member
I gain 200 to 250 psi when I hit the strong man switch at p2
funwithfuel
Senior Member
You lose pressure with boost? That would suggest your main relief is hurt.
ROPecht
Active Member
Yes I lose 10 to 15 psi at the bucket curl switch. But gain 200 to 250 psi at p2 switch.
funwithfuel
Senior Member
Please do the same test with boom up. It uses 2 pump flow but at end of travel you'll be relying on P2. See if that boost phenomenon repeats itself. Thanks.
ROPecht
Active Member
funwithfuel
Senior Member
Still thinking we have a relief issue. At this point, I'm thinking the best thing to do is to establish baseline pressures. In travel, your running on raised pressure. If raised is compromised, we need to find out where. Next step, invest in gauges and T-fittings or hand it off to the dealer. I don't want to suggest shotgunning parts.
funwithfuel
Senior Member
Being a C series, everything should be ORFS If you decide to invest in a gauge set
Ben Witter
Senior Member
@ROPecht For any hydraulic related performance complaint I always recommend measuring cycle times on all functions. Travel L, R forward, reverse, high and low speeds, boom up, down, arm in, out, bucket in, out,
Then as @uffex stated run it in manual mode to see if the complaint remains. Do not worry about holding the bucket in while traveling, as that puts it into straight travel mode and defeats testing the regulators and how they are stroked. Are you using the straight travel pedal and not both travel pedals? This simplifies diagnosing travel deviation complaints.
Your pics showing P1 and P2 current I assume are while you are traveling straight or trying to or am I wrong? If so and the current is different, especially while using the straight travel pedal , I suspect one of your pump output sensors is off. This can best be verified by comparing the sensor readings with an accurate gauge(s). But please do not just replace the sensors. Do the troubleshooting first, as it could be something else.
Your main relief pressure is a little low but that should not affect travel or bucket speed.
Then as @uffex stated run it in manual mode to see if the complaint remains. Do not worry about holding the bucket in while traveling, as that puts it into straight travel mode and defeats testing the regulators and how they are stroked. Are you using the straight travel pedal and not both travel pedals? This simplifies diagnosing travel deviation complaints.
Your pics showing P1 and P2 current I assume are while you are traveling straight or trying to or am I wrong? If so and the current is different, especially while using the straight travel pedal , I suspect one of your pump output sensors is off. This can best be verified by comparing the sensor readings with an accurate gauge(s). But please do not just replace the sensors. Do the troubleshooting first, as it could be something else.
Your main relief pressure is a little low but that should not affect travel or bucket speed.
ROPecht
Active Member
When I'm tracking forward and reverse I'm using both pedals. I'm not familiar with a straight travel pedal. I only traveled forward and reverse with the bucket curled all the way in or out in order to perform a type of troubleshooting, I'm guessing to see if the right track was capable of moving the same speed as the left track. You are correct with the mA signals being different on p1 and p2, I was traveling. Would it be worth while just swapping the two sensors to see if the issue remains?
ROPecht
Active Member
I have a stupid question to ask, how is when I'm curling the bucket in or out that the bucket pressure will be at 550 psi or so even when it comes to a dead stop midstroke for several seconds?
Ben Witter
Senior Member
The pressure sensor values for the different functions are the servo values. As long as the reach around 550psi or greater and increase proportionally with the movement of the joystick, then those pressures are fine.
Perform the cycle time testing first then try traveling in manual mode. Then report back.
Perform the cycle time testing first then try traveling in manual mode. Then report back.
ROPecht
Active Member
Does manual mode differ from service mode?
funwithfuel
Senior Member
Yes, manual takes a lot of sensors out of the equation and just gives a flat 80% pump output. Ben Witter has given solid advice. Measuring cycle times is extremely helpful in determining pump health. If everything straightens out in manual, that would further imply lazy, flat or erroneous sensor values.
ROPecht
Active Member
How do I put the machine in manual mode?
funwithfuel
Senior Member
Should be 2 to 3 switches in the left armrest closer to the elbow. Should be a cover with a couple thumbscrews holding in place. Under the cover should be a switch for auto/manual, eng rpm and maybe a switch for 2 pump flow (optional)
ROPecht
Active Member
Issue with slow bucket and slow right track still remains when in manual mode. The right track isn't as slow as when in normal mode but still noticeably slower.
At idle ( 948 ) rpms:
Bucket curl in: 16 sec.
Bucket curl out: 16 sec.
Stick in: 8 sec.
Stick out: 8 sec.
Boom UP from as low as I can get it with Stick straight out: 17 -18 sec.
Boom DOWN : 3 to 4 sec.
Right track full revolution: 1 minute and 10 sec.
Left track full revolition: 20 sec.
At (1896 ) rpms:
Bucket curl in: 11 sec.
Bucket curl out: 8 sec.
Stick in: 5 sec.
Stick out: 4-5 sec.
Boom up: 6 sec.
Boom down: 3-4 sec.
Right track: 35 sec.
Left track: 13 sec.
At idle ( 948 ) rpms:
Bucket curl in: 16 sec.
Bucket curl out: 16 sec.
Stick in: 8 sec.
Stick out: 8 sec.
Boom UP from as low as I can get it with Stick straight out: 17 -18 sec.
Boom DOWN : 3 to 4 sec.
Right track full revolution: 1 minute and 10 sec.
Left track full revolition: 20 sec.
At (1896 ) rpms:
Bucket curl in: 11 sec.
Bucket curl out: 8 sec.
Stick in: 5 sec.
Stick out: 4-5 sec.
Boom up: 6 sec.
Boom down: 3-4 sec.
Right track: 35 sec.
Left track: 13 sec.
Ben Witter
Senior Member
Were these times in auto or manual mode? Either way all the cycle times look slow, just some are much worse than others. Make sure you are in auto mode and the machine is at operating temp when measuring cycle times. I like to measure 3 cycles of each function and average them. Track speed is measured in 3 complete revolutions and waiting to start measuring after one full revolution to ensure you are up to speed. Oh and use a stop watch.
Cycle times at full engine rpm should be
Travel lo 28.2 sec
Travel hi 15.2 sec
Boom up 2.5 sec
Boom dn 2.4 sec
Arm in 2.8 sec
Arm out 2.2 sec
Bucket in 3.0 sec
Bucket out 2.2 sec
Swing 18.5 sec Like travel 3 revolutions after 1 full revolution.
If your cycle times are consistent with your previous findings then it may be a pump or regulator issue
Cycle times at full engine rpm should be
Travel lo 28.2 sec
Travel hi 15.2 sec
Boom up 2.5 sec
Boom dn 2.4 sec
Arm in 2.8 sec
Arm out 2.2 sec
Bucket in 3.0 sec
Bucket out 2.2 sec
Swing 18.5 sec Like travel 3 revolutions after 1 full revolution.
If your cycle times are consistent with your previous findings then it may be a pump or regulator issue