Hot hose protection?

[rScotty]

B21 problem

I had a problem this weekend that I had not experienced before and thought some of you might be able to shed some light on what happened. After about 5 hours of continues use of the backhoe and loader on my B21 the hydraulics gave out. The backhoe would not respond at all and the loader would...

www.tractorbynet.com

Interesting old thread. Reading it makes me wonder if a restriction could be causing hot hydraulic oil. If so, it could be quick disconnects, backhoe lever/3pt connections, or a relief valve sticking. The theme that continues to pop up in some of these old threads is that the hydraulic quick couplers sometimes don't connect properly. Several people mention that they had to disconnect them, clean the tips, and connect them again.

Hydraulic Oil Temp.

For no good reason other than I wanted too. I added a temperature indicator to the Hydraulic reservoir. I figured if I knew what normal was I might be able to figure out when things weren't normal. I used a digital probe that fits quite nicely in the hole for the dip stick. The probe comes with...

www.tractorbynet.com

This thread also contains a working link for simple hydraulic temperature gauge that fits some kubotas. From the context of the thread it may fit the B21.
Mostly what I read is a lot of good reports on the B21 from 20 years ago.

 

[rScotty]

Are the radiators clean enough to see light through them?

That reminds me that I need to open the hood and look at mine. I try to clean around in the engine compartment and radiators every year or so. A soft brush and hot soapy water followed by a garden hose rinse.
The Kubota doesn't leak oil so doesn' have a need to risk the damage that a pressure washer can inflict.
Next warm day,
rScotty

 

[joea99]

Are the radiators clean enough to see light through them?

The oil cooler is an "open tube" design, basically a pipe bent into a bunch of "u-turns", nothing much to plug up.

 

[joea99]

B21 problem

I had a problem this weekend that I had not experienced before and thought some of you might be able to shed some light on what happened. After about 5 hours of continues use of the backhoe and loader on my B21 the hydraulics gave out. The backhoe would not respond at all and the loader would...

www.tractorbynet.com

Interesting old thread. Reading it makes me wonder if a restriction could be causing hot hydraulic oil. If so, it could be quick disconnects, backhoe lever/3pt connections, or a relief valve sticking. The theme that continues to pop up in some of these old threads is that the hydraulic quick couplers sometimes don't connect properly. Several people mention that they had to disconnect them, clean the tips, and connect them again.

Hydraulic Oil Temp.

For no good reason other than I wanted too. I added a temperature indicator to the Hydraulic reservoir. I figured if I knew what normal was I might be able to figure out when things weren't normal. I used a digital probe that fits quite nicely in the hole for the dip stick. The probe comes with...

www.tractorbynet.com

This thread also contains a working link for simple hydraulic temperature gauge that fits some kubotas. From the context of the thread it may fit the B21.
Mostly what I read is a lot of good reports on the B21 from 20 years ago.

Yeah, I think I will stick with either the HF infrared pistol, or the thermocouple plug in for my multimeter.
It is probably not "overheating" anyway, touching any surface that is over 120 F is likely to cause a reaction, especially if unexpected. I rarely smell the hydraulic fluid unless I am really pushing the machine in hot weather.

I will take more care with the QD's in any case.