11
190-999 Rev G
MT8 Maintenance (Cont’d)
3. Diaphragm Installation
a. Assemble diaphragm followers (21) (190-072) onto the
diaphragms (18) (190-018-07) hand tight.
b. Install one o-ring (19) (190-050-10) onto back side of
diaphragms (18) (190-018-07).
c. Install one o-ring (17) (190-050-11) onto front of each
diaphragm (18) (190-018-07).
d. Seat each of the three diaphragm / O-ring assemblies
into the diaphragm backer plate (20) (190- 421) as shown.
Videos for Priming, Diaphragm Replacement and Check Valve
Replacement.
https://www.youtube.com/watch?v=UeM4y3-AcSk
(Fluid End Priming)
https://www.youtube.com/watch?v=Hgz-qhOcSVw
(Hydraulic End Priming)
https://www.youtube.com/watch?v=UbChCrUkb7U
(Diaphram Replacement)
https://www.youtube.com/watch?v=Uh30nwD0KC8
(Check Valve Replacement)
18
21
20
19
18
17
18
4. Fluid End Service
CAUTION: If the bolts (6) that hold the manifold body (4) /
(10)* in place are loosened or removed, a diaphragm kit will
need to be ordered and installed because the diaphragms
(18) will no longer seal properly and will need to be replaced.
CAUTION: If the bolts (2) / (16)* that hold the top manifold
(1) / (13)* or bottom manifold (5) / (12)* in place are loosened
or removed in order to inspect the check valves, then
O-rings (7), O-rings (8) and crush rings (9) will all need to be
replaced for the check valves to seal and function properly.
*For non-metallic pump heads
5. Maintenance Videos