Help Support SkidSteer Forum:
Does the parking brake light go out when you press the enable button on the instrument panel?
Have you done anything with the instrument panel that would have changed some of the configurations?
Does the hydrostat low pressure light come on?
I believe the instrument panel needs to see charge pressure before it will release the brakes and supply charge pressure to the hydros.
Have you done anything with the instrument panel that would have changed some of the configurations?
Does the hydrostat low pressure light come on?
I believe the instrument panel needs to see charge pressure before it will release the brakes and supply charge pressure to the hydros.
Parking brake light goes out. We tried to reset by disconnecting the battery terminals and grounding them.Hydrostat low pressure light is on now. How do we make the instrument panel see charge pressure. The bucket and boom works fine, just a no go with the wheels.
If the light is on you could have one of three possible problems. No charge pressure, bad pressure sender, or a wiring problem. The charge pressure sender is on the small valve body behind the right hydrostat motor. This valve block also has the two speed valve and parking brake valve in it. The charge pressure switch is located between the two solenoid valves. I have never tried it, but you might just unplug the pressure switch and see if that fools the instrument panel into thinking you have charge pressre. Check the charge pressure switch if you have continuity between the terminals when it is unplugged and the engine off. I think it completes the ground circuit when there is no charge pressure.
Did all that, how do you test charge pressure and whats it supposed to be? Trouble started after dealer worked on control servo for the RH side.
Thank you Mike, will give it a try.
Mike10 is there any way to get clearer pics, I can't read them, or can you e-mail me docs?
I know picture is not the best, but I have to figure out how to send documents like this with the compression that is required to post it. I think you can make out the test port from the photo in the document.
The following is what the page says. If you have no charge pressure do not run as specified below to warm the oil. If you have no charge pressure you will probably need to pull the hydrostat pumps to see if something happened to the charge pump.
Charge pump Pressure
test
The following is what the page says. If you have no charge pressure do not run as specified below to warm the oil. If you have no charge pressure you will probably need to pull the hydrostat pumps to see if something happened to the charge pump.
Charge pump Pressure
test
Testing the lowpressure
charge system is safer and usually more informative than going into the highpressure
test
ports. To obtain as much system information as possible, charge pressure readings must be taken in neutral as well
as working the system in both the forward and reverse directions.
With the system in neutral, only charge pressure is present in the closed loop. At this time, the leakage from the
system is the least and the charge pressure is the highest. As the system is pressurized, the leakage from the system
will increase and the charge pump flow will make up for this leakage. With more of the charge pump oil flowing to
the closed loop, less oil will flow across the charge pressure relief valve, and therefore the pressure will be slightly
less. If the leakage from the system is excessive, the charge pressure will drop off more. This slight drop in charge
pressure between the system in neutral and with the system under load indicates the condition of the closed loop
system components.
charge system is safer and usually more informative than going into the highpressure
test
ports. To obtain as much system information as possible, charge pressure readings must be taken in neutral as well
as working the system in both the forward and reverse directions.
With the system in neutral, only charge pressure is present in the closed loop. At this time, the leakage from the
system is the least and the charge pressure is the highest. As the system is pressurized, the leakage from the system
will increase and the charge pump flow will make up for this leakage. With more of the charge pump oil flowing to
the closed loop, less oil will flow across the charge pressure relief valve, and therefore the pressure will be slightly
less. If the leakage from the system is excessive, the charge pressure will drop off more. This slight drop in charge
pressure between the system in neutral and with the system under load indicates the condition of the closed loop
system components.
IMPORTANT:
For the following test the machine MUST be raised up on supports until the tires are above the floor.
This is a safety procedure if the parking brake fails to hold.
IMPORTANT:
You will need two people to perform this test. The operators seat must be raised to gain access to the
hydrostatic pumps. In order to start the engine, someone will need to fasten the seat belt and press on the seat to
close the seat switch.
close the seat switch.
1. Raise and securely block the unit off the ground.
Connect a 4,137 kPa (41 bar) (600 psi) pressure
gauge to test port 1, see next figure.
Connect a 4,137 kPa (41 bar) (600 psi) pressure
gauge to test port 1, see next figure.
2. If the hydraulic oil is not at operating temperature run
the engine at full throttle and hold the bucket control
lever in the ROLLBACK position for 30 seconds.
Then return the bucket control lever to NEUTRAL for
15 seconds. Repeat this cycle until the temperature
of the oil is at least 52°C (125°F).
3. Continue to run the engine at full throttle. Read
the pressure gauge and record the Charge Pressure
reading. Stop the engine.
4. The pressure must be a minimum of 2,482 kPa (24.8
bar) (360 psi) at full throttle.the engine at full throttle and hold the bucket control
lever in the ROLLBACK position for 30 seconds.
Then return the bucket control lever to NEUTRAL for
15 seconds. Repeat this cycle until the temperature
of the oil is at least 52°C (125°F).
3. Continue to run the engine at full throttle. Read
the pressure gauge and record the Charge Pressure
reading. Stop the engine.
4. The pressure must be a minimum of 2,482 kPa (24.8
Thank you
Mike, Thanks for the help. My name is mike also, we tested the pressure it was 50 psi instead of the 360 psi, I've been the middle man on this Jack has the machine we are working on he's a mechanic, me backyard, he has no computer. Is there anyway you can call him at (208) 860-0270 in MST. Thanks