BX1500 hydrostatic tranny prob

jerkyboy · Jun 27, 2011

Be sure to let us know what's going on.

UWAdventurer · Jul 16, 2011

Well, the BX1500 is in the shop and so far they can't find the problem. They said they will have to open the tranny to look at it. The pressure is lower on the forward relief valve than the reverse relief valve. The charge pressure is good. No shaving to speak of in the filter or screen. No brass flakes, etc. No whining. Dealer is stumped. Looks like more money to determine the problem.

Ideas anyone? Thanks.

SPYDERLK · Jul 16, 2011

UWAdventurer said:
Well, the BX1500 is in the shop and so far they can't find the problem. They said they will have to open the tranny to look at it. The pressure is lower on the forward relief valve than the reverse relief valve. The charge pressure is good. No shaving to speak of in the filter or screen. No brass flakes, etc. No whining. Dealer is stumped. Looks like more money to determine the problem.

Ideas anyone? Thanks.

When my BX1500 trans went out it checked out fine from the outside. Kub figured it was the cradle bearing and I replaced the trans on that assumption. I havnt gone into the old trans yet.
larry

jerkyboy · Jul 16, 2011

SPYDERLK said:
When my BX1500 trans went out it checked out fine from the outside. Kub figured it was the cradle bearing and I replaced the trans on that assumption. I havnt gone into the old trans yet.
larry

When you refer to the trans, do you mean the HST?

SPYDERLK · Jul 16, 2011

Yes.
larry

jerkyboy · Jul 20, 2011

UWAdventurer said:
Well, the BX1500 is in the shop and so far they can't find the problem. They said they will have to open the tranny to look at it. The pressure is lower on the forward relief valve than the reverse relief valve. The charge pressure is good. No shaving to speak of in the filter or screen. No brass flakes, etc. No whining. Dealer is stumped. Looks like more money to determine the problem.

Ideas anyone? Thanks.

Any update?

MattJ · Jul 20, 2011

Not sure how they would have checked the tranny out without opening it up? Did they shake it and see if parts rattled!

If/when you do open it all you need is a metric hex adapter. Put some sort of non-maring clamp on the housing and remove the bolts. Then, plce it flat side down and slowly release the clamp. The piston springs will open the housing up. If you do it flat side down the pistons all stay in the assembly. If you don't, they all spill out and the pistons and assemblies are matched sets which creates a problem. If you take a look at the parts explosion for the HST you'll see what I'm referring to.

UWAdventurer · Jul 20, 2011

Just got an update. The forward relief valve is bad. The dealer says around a $1000 repair. Good news was the rest of the hydrostat looked good, no problems.

The dealer called Kubota and the cause of the valve going bad according to Kubota is the two cylinder engine vibration. Kubota said they have seen "a handful" of bad relief valves and they have all been on the BX1500.

Debating now on whether to fix it and keep it or trade it for a BX1860.

Thoughts everyone? Who has a BX1860 that can give me some pros and cons on it?

SPYDERLK · Jul 21, 2011

MattJ said:
Not sure how they would have checked the tranny out without opening it up? Did they shake it and see if parts rattled!

If/when you do open it all you need is a metric hex adapter. Put some sort of non-maring clamp on the housing and remove the bolts. Then, plce it flat side down and slowly release the clamp. The piston springs will open the housing up. If you do it flat side down the pistons all stay in the assembly. If you don't, they all spill out and the pistons and assemblies are matched sets which creates a problem. If you take a look at the parts explosion for the HST you'll see what I'm referring to.

Good info. Ill have to remember that when I open my old one. They check the tranny hydraulically by measuring various pressures from the outside. Mine was OK there -- it just didnt work.

UWAdventurer said:
Just got an update. The forward relief valve is bad. The dealer says around a $1000 repair. Good news was the rest of the hydrostat looked good, no problems.

The dealer called Kubota and the cause of the valve going bad according to Kubota is the two cylinder engine vibration. Kubota said they have seen "a handful" of bad relief valves and they have all been on the BX1500.

Debating now on whether to fix it and keep it or trade it for a BX1860.

Glad they found it. That high labor cost is why I just had my HST changed out for just a few hundred $ more.
larry

jerkyboy · Jul 21, 2011

UWAdventurer said:
Just got an update. The forward relief valve is bad. The dealer says around a $1000 repair. Good news was the rest of the hydrostat looked good, no problems.

The dealer called Kubota and the cause of the valve going bad according to Kubota is the two cylinder engine vibration. Kubota said they have seen "a handful" of bad relief valves and they have all been on the BX1500.

Debating now on whether to fix it and keep it or trade it for a BX1860.

Thoughts everyone? Who has a BX1860 that can give me some pros and cons on it?

Is that the total repair bill? If so, I'd get it fixed and keep it for sure. Also, based on my review of the WSM, it looks like you don't have to pull the HST out to replace the forward high pressure relief valve, am I correct??