BBM DIESEL 1100cc MODEL ZERO-TURN MOWER. Manual - part 8

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LEVELING THE DECK:

1) Start on a flat level surface and set the air

pressure in all four tires to 12 psi.

2) Get two 2x4s and make sure that the wider sides

are similar length.

3) Take off the foot pedal and raise the floor plate.
4) Lower the deck onto the 2x4s and pin the deck

into its top available height. Remove the
dampener that attaches to the actuator bar using
two ½” wrenches.

5) Now ensure that the deck is level left to right and

has a pitch down of ¼” from the back to
the front. This can be done by adjusting the tabs
on the deck.

6) Loosen the bolts on the back of the deck using

two ¾” wrenches until the deck hanger is resting
against the bolt.

7) Adjust the front deck hanger until there is ¼” gap

between the deck hanger and the bolt that it
rests on.

8) Reattach the dampener to the actuator bar.
9) Place the floorplate down and place the foot

pedal back on and you should be ready to mow.

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The deck spring tension is critical. If the tension is too 
high, premature failure of the deck belt and blade 
spindles can occur. If the tension is too low, the belt can 
‘jump off’ or slip on the pulleys. This results in reduced 
cut quality and early belt failure.  

Spring tension adjustments can be made by sliding the 
bolt shown above forward or backward in the slot of the 
deck. Belt tension should be 65-70 lbs with the deck at 
its lowest setting. 

Use a belt tension gauge to ensure the proper tension. 
Your dealer or service center will have a belt tension 
gauge or you can buy one (Part Number 041-9999-00). 

BLADE SHARPENING:
The blade  on the top (see photo) was utilized long 
after replacement was required. In addition to a decline 
in cut quality, failure to replace a worn or damaged 
blade creates a major safety hazard. Bad Boy 
recommends that blade sharpening be performed by a 
professional. 

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BLADE REMOVAL:

To change blades, it may be easier to use a piece of 

wood to keep the blade from turning so that the bolt can 

be loosened. Use a 15/16” socket and impact Drill, or a 

wrench and an extension to gain more leverage. You 

might need to put a ¾” wrench on top of the pulley bolt 

to keep the blade from spinning.  Bolts used have right-

handed threads.   

Re-torque the blade bolts to 90-110 lbs. 

The blade spindles contain a sealed ball bearing inside 

the top and bottom of the spindle. The bearings are 

replaceable for a more cost effective repair.

 

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