Mighty Mule MM402 - Manual (Page 29)

rev 082211 Mighty Mule FM402 Installation Instructions 19
PUSH-TO-OPEN gates open out from the property (opener arms extend to open). Push-To-Open Brackets are required
for this type of installation, one for each gate [FM148] page 26. In a Push-To-Open installation, the opener is installed
while the gate is in the closed position and the opener fully retracted.
Swinging gates MUST NEVER open into public access areas!
Step 1: Read "Installation of the Gate Opener" on page 7.
Step 2: Determining The Mounting Position of The Post Bracket Assembly
A. Insert the 3 / 8 " x 1 1 / 2 " bolt through the center hole of the post
brackets and post pivot bracket. Secure with a 3 / 8 " washer
and 3 / 8 " lock nut. DO NOT overtighten the lock nut (the post
pivot bracket will have to be adjusted later). Attach post
bracket assembly to the rear mount of the opener with a clevis
pin and a 3 / 8 " washer. Secure the clevis pin with a hairpin
clip. Attach gate bracket to the front mount of the opener with
a clevis pin and a 3 / 8 " bushing. Secure the clevis pin with a
hairpin clip.
B. With the gate in the closed position (up to 110º from its open
position), and the opener fully retracted, adjust the post
bracket assembly and gate bracket until the opener is level.
While holding the opener level, use C-clamps to temporarily
keep the post bracket assembly and gate bracket in their
respective positions on the fence post and gate.
IMPORTANT: Be sure the position of the gate opener and
brackets allows for 1" of clearance between the gate and the
opener in both the open and closed position, while at the same
time maintaining a maximum distance of 13" from the end of
the opener arm to the gate bracket with the gate in the open
position. This mounting position will give the opener the most
efficient leverage point for operation and provides the least
possible pinch area.
C. After verifying that you have the best position for the post
pivot bracket in the closed position, insert the 5 / 16 " x 1 1 / 2 " bolt
through the aligned holes of the post bracket and post pivot
bracket to hold it in place. Remove the clevis pin from the front
mount and while supporting the gate opener, swing the
gate and gate opener to the open position. Again, check the
clearance and be sure that the gate opener is not binding at
the post pivot bracket.
IMPORTANT: If you don't have the required clearance, or if
the gate opener is binding, remove the 5 / 16 " x 1 1 / 2 " bolt and
readjust the post pivot bracket. TIP: Turn the post pivot bracket
over for more hole alignment options.
D. When the post pivot bracket assembly is in the optimum
position, reattach the opener to the gate bracket (gate in the
closed position); recheck the gate opener level; make sure the brackets are clamped securely. Mark reference
points for bolt holes on the post through middle of post bracket slots. Mark reference points for bolt holes on the
gate cross member through middle of gate bracket slots. After marking your reference points, remove the opener
and brackets from the post and gate.
E. Drill 3 / 8 " holes through post as marked. Fasten post bracket assembly to the post using two 3 / 8 " x 8" bolts,
washers and lock nuts. You must use bolts that completely penetrate the post. Drill 3 / 8 " holes through the
gate cross member as marked. Mount gate bracket using two 3 / 8 " x 2 3/4 " bolts, washers, and lock nuts.
Push-To-Open Installation Instructions
3/8 " x 1 1/2 " Bolt
3/8 " Lock Nut
Push-To-Open Bracket
(optional accessory FM148)
Post Bracket
Push-To-Open Bracket Assembly
3/8 " Washer
Gate in the Closed Position
Pinch Area (gray)
Gate in the Open Position
1" minimum
Pinch Area (gray)
1" minimum
13" maximum