BBM DIESEL 1500cc 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 65-75 lbs for the 60" deck and 
70-75 lbs for the 72" deck with the deck at its lowest 
setting.

Unlatch the back cover to access the pump belt. The 
pump belt  tension should be 60-70ft-lbs

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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