PRG Best Boy 4000 Service Manual page 62

Step 4. Disconnect four cables.
Step 5. At Wheel Stack, loosen captive screws.
Step 6. Verify that Lens Group 1 will not interfere with removal of Wheel Stack Assembly. If lenses are in the way,
turn Group 1 pulley until lenses are clear.
Step 7. Grasp Wheel Stack Assembly on either side and lift straight up and out of luminaire head.
Step 8. Install new Wheel Stack by doing steps in reverse.
Wheel Stack
Captive Screw
Lens Group 1
Figure 3-28: Removing Wheel Stack
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54 BEST BOY 4000 SPOT LUMINAIRE FIELD SERVICE MANUAL