john deere 7800

Hello. Last September, my friend bought a JD 7800 Powrquad for his 60 hectare farm. The tractor is mainly used for ploughing and cultivating. Last autumn and this spring it had no problems towing a 5 furrow reversible plough and cultivating with a 6 meter cultivator. However, a couple of days...

I need a repair manual for my JD7800. I see there are two choices, a tractor repair #TM1500 or a tractor operation & test #TM1501. What's the difference between the two? Thanks, JD