SDS Platform/Y-Shaped Underseat Subframe
From Unofficial Zero Manual
This frame piece spans the top of the frame between the part that sits behind the battery doghouse and the tail.
- Support and anchor the seat by two pins extending from the forward center section.
- Anchor the rear of the tank plastics.
- Mount the 12V Fuse Block on the left rear leg.
- Distributes the seat loading between the forward frame bracket arching over the monolith, and the horns of the rear tail.
- This protects underlying cabling, as well as dampens any load on the frame that would flex the tail relative to the forward part of the frame.
- Removable (vs being frame-integrated or welded) for servicing everything above the motor (MBB, DC-DC converter, and cabling and wiring).
- Forward: 2x 10mm hex nylon locknuts, with washers.
- Rear: 2x M5 socket cap bolts, 20mm length with a 2mm shoulder, 1mm depth, 6mm outer diameter, with washers.
- 10mm hex socket wrench with at least 20mm of depth.
- 5mm Allen key.
- Remove the seat.
- Use the 10mm socket wrench to loosen the locknuts anchoring the forward end of the washers.
- Use the 5mm Allen key to loosen the bolts at each of the rear ends of the frame piece.
- Remove the locknuts and the bolts in a coordinated pattern to avoid putting it under asymmetrical loading.
- Take care not to lose the washers in the frame piece or in the bike's cabling areas underneath as each bolt and nut comes off.
- Ensure the underlying cabling is placed in its original orientation to avoid strain.
- Press the frame piece's fastener holes onto the corresponding threaded bolts on the frame arch over the rear of the battery.
- Align the rear ends of the frame piece with the corresponding frame holes, and thread the bolts with washers gently into position (without tightening) to secure the frame piece.
- Thread (without tightening) the front locknuts with washers onto the forward bolts.
- Tighten the two forward nuts and rear bolts in a coordinated pattern to settle the frame piece into the right load-bearing orientation.
- Take care while tightening not to strain any cables or wiring underneath the frame piece.