Hoshizaki ACK-40-A Instruction Manual page 10

If the pack assy cannot be inserted, the coupling may be locked.
Press the button as shown to unlock the coupling, and try again.
5) Part Nos. 5 and 8
Screw (2 points at top and bottom)
Barrier - Spring (No. 5)
7
After tightening the pack cap nut, insert the pack assy into
the coupling taken out in Step 7 until it clicks.
Step 10 [KM-40/60/80C(-HC)]
Use the two T2 truss head tapping screws (No. 2) to fix
the barrier - spring (No. 5) and barrier - control box (No. 8)
in their correct position as shown.
ENGLISH
Screw (2 points)
Barrier - Control Box (No. 8)