If you use the "Search" function, it looks to me like you'll be able to find some threads about a Woods BH90 (or its predecessor, the B9000) on the smaller Grand L's. The 3540 has 8.3gpm available for the implements if you use remote hydraulics instead of a separate pto pump. A Woods dealer should be able to advise how that might work with their BH90 (or maybe a phone call to Woods). The pump would eliminate any flow limitations, of course, but costs additional and is a minor hassle when attaching/detaching the BH.
Just going on what has happened to me, backhoe performance is a function of hydraulic flow more than pto horsepower, and the backhoe seems to be just as happy with moderate rpm as running at full throttle. That's in contrast to the operator - me - who needs to back off the rpm since too much flow makes everything pretty quick and jerky on my BH... a reflection of the operator, no doubt!Note I have a Kubota hoe, not a Woods. So your 28 pto hp might be marginal on paper but in practice may be fine. Maybe someone else can give a better comment.
Size and weight wise, I think your 3540 should handle the BH90 OK.
Ive searched..... trust me!:laughing: