Zd331 Mower deck surging

[forceten]

Had the gearbox on thew mower deck leak out and take a crap end of last season.

Put on a brand new gearbox this season, two cuts so far on it. But I have been noticing the mower deck or engine surges slightly when the pto is engaged and the blades are spinning.

So such surging without the pto on. So i assume it's something with the deck. The rpms don't seem to really dip on the engine, but I can definitely hear a surge, how can I explain it a slight rwooar rwooar rwoooar as I cut. I don't seem to lose power or anything but I wanna catch whatever is happening before it breaks down on me.

New gear box has the proper fluid and it spun freely before I put it on.

What should I be looking at?

 

[dlundblad]

I'm not familiar with your model, but does it have a driveshaft? If you lost the gearbox mid use, perhaps something was tweaked.

 

[D2Cat]

Have you checked to be sure the spindle bearings are not dragging, or an idler not free?

 

[mikester]

Have you checked your mower belt? Sometimes they delaminate and you will hear weird sounds.

Another thing to check is that the belt has been routed properly.

 

[RCW]

force - -

Nice to see you back!

Is the machine cutting as expected? No gaps, uneven, etc.? Blades on correctly, balanced, right side up? Vibration?

I would double-check the PTO shaft also. Make sure driveline is solid/locked to ZT PTO, free back/forth movement along the splines, etc. (I admit I'm not familiar with the PTO connection with any ZT)

Second guess would be spindle, like 'Cat said.