On my 742B I found that if I got the engine rotated just right, I could see at least one zerk with them positioned on the left side of the machine (that's the left when sitting in the seat, but right when laying on your stomach facing the rear/ engine) at roughly 2 o'clock position when looking towards the rear of the machine. I could only see it with one eye, the other eye was blocked, but it was easier to clean them and to attach a locking grease gun end onto all three in that position than with them rotated to the other side where I could see nothing. I marked the engine crank pulley and outer shroud with match lines so I could turn it to the right place the next time.