I would like to know the weight of a jcb 1400b backhoe

All to do with electronics and microswitches.

https://www.google.com/search?q=JCB+Backhoe+won%27t+go+into+reverse

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Sorry we do not have that kind of information here.

you can get the solution here.
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The travel lock is either in place keeping it from moving in transport or there is something wrong with the hydraulics. Look for a push button release. The other thing is the stabilizers have to be engaged

Old.

This forum states they are crap
http://www.heavyequipmentforums.com/showthread.php?540-jcb-214s-owners-opions

You should try asking there for more help.

Is there any hydraulic oil that is compatible with a case 1390 tractor?

most of those type of equipment have inboard brakes in the axle tubes of the rear gear assembly i.e. follow your brake lines from the master cylinder to the rear axle assembly,the lines usually go in and to a caliper and another line comes out to a bleeder tip nipple ,some models are actually inside the axle tubes them selves requiring disassembly of the wheels ,axle tubes etc. until you get to the inboard rotors and calipers ,major work for such a minute ordeal this is done to keep the system protected believe it or not,i would obtain yourself a model repair manual if i were you or you could also go to jcb and ask them for a photo copy of the entire brake hydraulic system

If I talk about India than I can suggest to you a good amount of JCB Spare Parts Manufactures and You can deal all parts Related to JCB And Backhoe Spare parts also Order From Here.

Automatic transmission flu

I think you need Check your Transmission Pressuer of your machine. After That Change Recormanded Transmission Oil & Right Quntity. Transmission Pressure Should be 10-12 bar.