Hello, I have read this forum for a while and found it has alot of great advice. I currently have an issue with a BX1830. I was pulling a trailer that was probably about 2000lb, not too aggresively, when suddenly I started to get a lot of vibration and feedback in the foot peddle and it sounded like it was starved for hydraulic pressure. Once it was up to speed the vibration stopped, by any demand on it load wise and it started again.
The tractor has ~500hrs on it and has also been well maintained and used mainly for mowing and clearing snow.
Looking at the shop manual and reading some other threads here I did the following:
First I checked the hydraulic oil level, it was fine. Thinking the screen might be plugged I went ahead and did an hydraulic oil change (super UDT2), and changed the filter, and cleaned the screen. The filter had a few dings but was intact, the screen had about tiny of metal on it, but this was the first time it was cleaned.
I then checked the pressure on the loader hydraulics both at a standstill and while moving up a hill with the vibration occuring. Both were a bit high (I used shims in the past as the pressure was low at 400hr). At a standstill the pressure was around 1900, and under load up the hill the motor wasn't bogging at all, the vibration was occuring, but the loader pressure read around 2000psi. So it seems the hydro pump is working fine.
Next I went through cleaning the charge relief valve and the PTO relief valve(both looked great), and I tested the pressure at the high relief check location within the forward direction circuit. It was a few hundred psi when I had the tractor on jacks, in high range and with the peddle depressed forward per the manual. The manual listed the high pressure relief dumps at 1990 psi. I applied the brake as hard as I could and pressed forward and the vibration was occuring and the pressure read around 1000 psi. As an fyi the vibration occurs in both forward and reverse.
I'm not sure what the normal pressure should be but it seems like the hydraulic motors were not getting enough flow/pressure. I started to wonder if the high pressure on the implement relief valve might be to blame. Per the manual the flow from the hyd pump comes past the relief valve, and then is divided between the accessories and HST by the flow priority valve. I was wondering if too high of a relief pressure setting was causing an issue. So I took my shims out and got the pressure at the loader down to the lower end of the range in the manual (1750). Driving the tractor the problem isn't as bad but trying to scoop dirt or drive up hills there still isn't much power. Even in low range driving forward to scoop light mulch it starts to vibrate and doesn't have much power. The vibration feeds back all the way through the peddle even and seems like hydraulic chattering. Could the flow priority valve be dumping too much to the implements and not delivering the required flow/pressure to the HST?
Thanks for your help.
- Matt
The tractor has ~500hrs on it and has also been well maintained and used mainly for mowing and clearing snow.
Looking at the shop manual and reading some other threads here I did the following:
First I checked the hydraulic oil level, it was fine. Thinking the screen might be plugged I went ahead and did an hydraulic oil change (super UDT2), and changed the filter, and cleaned the screen. The filter had a few dings but was intact, the screen had about tiny of metal on it, but this was the first time it was cleaned.
I then checked the pressure on the loader hydraulics both at a standstill and while moving up a hill with the vibration occuring. Both were a bit high (I used shims in the past as the pressure was low at 400hr). At a standstill the pressure was around 1900, and under load up the hill the motor wasn't bogging at all, the vibration was occuring, but the loader pressure read around 2000psi. So it seems the hydro pump is working fine.
Next I went through cleaning the charge relief valve and the PTO relief valve(both looked great), and I tested the pressure at the high relief check location within the forward direction circuit. It was a few hundred psi when I had the tractor on jacks, in high range and with the peddle depressed forward per the manual. The manual listed the high pressure relief dumps at 1990 psi. I applied the brake as hard as I could and pressed forward and the vibration was occuring and the pressure read around 1000 psi. As an fyi the vibration occurs in both forward and reverse.
I'm not sure what the normal pressure should be but it seems like the hydraulic motors were not getting enough flow/pressure. I started to wonder if the high pressure on the implement relief valve might be to blame. Per the manual the flow from the hyd pump comes past the relief valve, and then is divided between the accessories and HST by the flow priority valve. I was wondering if too high of a relief pressure setting was causing an issue. So I took my shims out and got the pressure at the loader down to the lower end of the range in the manual (1750). Driving the tractor the problem isn't as bad but trying to scoop dirt or drive up hills there still isn't much power. Even in low range driving forward to scoop light mulch it starts to vibrate and doesn't have much power. The vibration feeds back all the way through the peddle even and seems like hydraulic chattering. Could the flow priority valve be dumping too much to the implements and not delivering the required flow/pressure to the HST?
Thanks for your help.
- Matt
