Revision 1.8 / June 2016
23
Assembly Instructions for Installation of Front Cover Hinge
The front cover hinge is available for the MR-135 and the MR-150 MasoSine Pump. It allows for the
front cover to be hinged to the pump housing for easier maintenance. When assembling the front
cover hinge, follow the steps below and refer to
and the associated parts list. Install the hinge
only when the front cover is attached to the pump housing.
1. Attach the ring arm, item 1a or 1b, to the top nozzle of the pump and insert the two cap screws,
item 3, into the slots on the diameter of the ring. Do not tighten the cap screws completely. NOTE:
The ring arm is two pieces, a half ring and a half ring with a rectangular bar welded to it. The ring
arm can point to either side of the pump depending on which way you prefer the front cover to
swing away from the pump housing.
2. Stack the following items, with their holes aligned, above the hole at the end of the ring arm in the
order listed: a.) one plastic washer, item 4, b.) the pivot arm, item 2, using the smaller diameter
hole c.) the other plastic washer, item 4, and d.) the stainless steel washer, item 5. Install the bolt,
item 5, by fitting it through the stacked items and threading it into the hole on the right arm.
Tighten the bolt until the parts are secure but loose enough to allow rotation of the pivot arm.
Thread the hex nut, item 7, onto the bolt and tighten securely to lock the bolt in place.
3. Attach the rod end, item 8, with two washers, item 11, on either side of the ball, to the front cover
using the bolt, item 10. The bolt will thread into the tapped hole on the front cover.
4. Place the washer, item 11, on the bolt, item 9, and insert the bolt through the hole on the end of
the pivot arm. Thread the hex nut, item 12, onto the end of the bolt, but do not tighten.
5. With the rod end held upwards toward the pivot arm, thread the bolt into the hole in the rod end.
6. Rotate the ring arm until the rod end is vertical as shown in
. Tighten the cap screws until
the ring arm is secure.
7. Tighten the bolt which connects the pivot arm to the rod end until the head comes into contact with
the washer.
8. Remove the wing nuts and front cover. By either tightening or loosening the hex nut on top of the
rod end or adjusting the alignment of the ring arm, the height of the front cover when hanging can
be modified to ease assembly.
Two holes have been drilled and tapped in the face of the front cover to house the bolt which
holds the front cover onto the hinge assembly. One of the holes will not be used depending on the
location of the hinge assembly and the orientation of the inlet and outlet nozzles. This hole can be
fitted with a 3/8 - 16 x /" bolt.
