Grain Systems Tanks PNEG-257 - Manual (Page 39)

7. Roof
PNEG-257 12', 15', 18' and 21' Bulk Feed Tanks BFT and GHT Series 39
Figure 7R
Figure 7S
Make sure the loop of the main cap spring (BLK-11623) is held securely
in the pre-loaded position by the head of the 5/16" bolt beneath.
If necessary, place one or more 5/16" flat washers under the bolt head to ensure that the bolt
catches the loop.
WARNING
The control arm is spring loaded. It must be released while on the ground and
before attaching it to the peak ring. Failure to do so will result in serious injury.