check hydraulic fluid pressure

[hatchet]

I have a 78 bobcat and i screwed a pressure guage where the hydraulic temp sender was and got a 0 reading.Is that the wrong place to check or is my guage bad

 

[KyMadMan]

If you haven't done so yet, download the service manual for whatever model you have. You're not going to get any kind off accurate reading at the temp sending unit. Most people hook into the aux lines. It is dependent on what model and features you have.

 

[hatchet]

If you haven't done so yet, download the service manual for whatever model you have. You're not going to get any kind off accurate reading at the temp sending unit. Most people hook into the aux lines. It is dependent on what model and features you have.

I just found out i screwed the guage into low pressure sender port.

 

[ward]

Any time checking pressure on a function I always "T" into that function, I used to keep a 4 foot 1/4 inch hydraulic line around to get the gauge to a remote location make sure that operating the function wont move the T fitting to a pinch point and test the pressure , also teas a unit that is warmed up.

 

[hatchet]

Any time checking pressure on a function I always "T" into that function, I used to keep a 4 foot 1/4 inch hydraulic line around to get the gauge to a remote location make sure that operating the function wont move the T fitting to a pinch point and test the pressure , also teas a unit that is warmed up.

I put a guage at the low pressure sender port and get 60 psi.Is that high enough.

 

[ward]

For make up oil for the hydrostatic drive, I would think it would be, however bucket lift and bucket curl I would think will be bewteen 2000 psi and 3000 psi, gear pumps do not like above 3000 psi, if it has a vane pump it might get pushed to 5000 psi.
Hydrostatic can run up to 20,000 psi however that is on large equipment, fork lifts and skid steers and dozers tend to work with 5000 to 10,000 psi on the hydrostatic system.
If I am checking a 2000 to 3000 system I used a 5000psi gauge to get it as close as I could when setting the relife, however if you just checking to see if you in close range a 3000 psi gauge will work, the gauges are most accurate in the center 1/3rd of the dial, so a 500 psi system checked on a 3000 psi gauge could be off by 10 to 20 %

 

[hatchet]

For make up oil for the hydrostatic drive, I would think it would be, however bucket lift and bucket curl I would think will be bewteen 2000 psi and 3000 psi, gear pumps do not like above 3000 psi, if it has a vane pump it might get pushed to 5000 psi.
Hydrostatic can run up to 20,000 psi however that is on large equipment, fork lifts and skid steers and dozers tend to work with 5000 to 10,000 psi on the hydrostatic system.
If I am checking a 2000 to 3000 system I used a 5000psi gauge to get it as close as I could when setting the relife, however if you just checking to see if you in close range a 3000 psi gauge will work, the gauges are most accurate in the center 1/3rd of the dial, so a 500 psi system checked on a 3000 psi gauge could be off by 10 to 20 %

For make up oil for the hydrostatic drive, I would think it would be, however bucket lift and bucket curl I would think will be bewteen 2000 psi and 3000 psi, gear pumps do not like above 3000 psi, if it has a vane pump it might get pushed to 5000 psi.
Hydrostatic can run up to 20,000 psi however that is on large equipment, fork lifts and skid steers and dozers tend to work with 5000 to 10,000 psi on the hydrostatic system.
If I am checking a 2000 to 3000 system I used a 5000psi gauge to get it as close as I could when setting the relife, however if you just checking to see if you in close range a 3000 psi gauge will work, the gauges are most accurate in the center 1/3rd of the dial, so a 500 psi system checked on a 3000 psi gauge could be off by 10 to 20 %

Thanks for the good info!