Do i have to remove the manifold when taking out the glow plugs in 743b bobcat and how do you remove the glow plugs and with what tool?

no. just use a socket to remove after removing electrical connects between the glow plugs. this is assuming you have a 1702 Kubota diesel. almost like removing a spark plug out of a gas engine.

one glow pump is hard to get out. may have to remove a ejector feed line for clearance.

hope this helps.