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Personal preference, 2000 hrs is minimal in my book. If it's not significantly down on power and not choking you while using it, and you don't have to add a gallon of oil between changes, I wouldn't be worrying about it. YMMV

A few pics in the kubota brochures and options. One thing about baggers in general, they generally only work with Very new blades, Very short grass, and dry grass, UNLESS they have their own powered blowers. If they don't have a blower, I personally would never buy one as I have never had a good...

How much do you want to spend, walk up with 20K green and lay it on the table and see how you go!

I use the "SITE:" search particularly as the OTT engine will not let you search for threads with 3 characters like B21, so to search for B21 threads site:www etc "B21" is great.

Your manuals will have all the specs in them. Or try here for a start http://kubota.com/product/B50/pdf/B50RopsSpecs.pdf http://www.landpride.com/ari/attach/lp/public/specs/310-366s.pdf

If you could downsize the pics it would be great!

Have a look on the kubota parts list for BF300A, http://www.kubota.com/part/partsList.aspx it appears pipes may be available here if I have grabbed the correct numbers Price may make you just replace each one as it goes, but availability could be an issue in the long run...

Replacement steel lines can be bent up by your hydraulic shop, and can also be replaced by flexible lines, depends on aesthetics and cost on which way you want to go.

If it's cable operated, pull the cables and clean and lube them to ensure they are not dragging and holding the valves in position.

If the valves aren't riding, one other thought, perhaps there was enough relief on the crank gear that allowed you to install it backwards so the timing mark is on the back side of the gear?

This post may be worth a read, with particular reference to TDC and gear marks. http://www.orangetractortalks.com/forums/showthread.php?t=631

It sounds like you may need to go back and have a closer look at the timing marks on the crank.

Any chance that you dropped/lost/knocked out a key from either shaft when reassembling, and now the gear has spun on the shaft?

Noting NIW's expert diagnosis, if you are mechanically proficient and want to follow this up further I offer the following. While pump parts are limited or unavailable through normal sources, the internal orings and shaft seals are available if needed for all the B7100 pumps from Coleman or...

What control layout do Kubota supply on hoes in the USA, SAE or ISO? https://en.wikipedia.org/wiki/Excavator_controls

Have a look here, select the magnifying glass top left corner, then click on what you want and it comes up on the right, and add to cart........ http://www.colemanequip.com/Kubota-B20-Tractors-Parts/HOODBONNET-CHASSIS-26525/LABEL-1-26589/

I've been looking for some for my B21, from the B20 parts list it shows http://www.colemanequip.com/Parts_Detail.asp?partID=9637 for RH side and LH both available http://www.colemanequip.com/Parts_Detail.asp?partID=9638 It also lists all the others, which it appears are available from Coleman

I'm very happy to have ham and egg on my face if I've stuffed up, so everyone please accept my apologies. The manual doesn't have L4740 in it's title, but has many references to it in the manual, so I suspected it was a Jap/Eng conversion miss as noted in other manuals. Once again, throw your...

Thats funny, this must be a ham sandwich then?

As stated first line above manual reference "No idea if they are any good" , and of course it may be one of the good 5% It's for a L4740-II, so I am sure there are some similarities Link fixed, didn't see that he had a manual, hopefully the listed manual will hep some else out. I also said...