81883XPage 10 of 12
TROUBLE SHOOTING
Product discharged from air exhaust.
S Check for diaphragm rupture.
S Check tightness of (6) diaphragm nut or (14) bolt.
Air Bubbles in product discharge.
S Check connections of suction plumbing.
S Check band clamps on intake manifold (nonĆmetallic models).
S Check O" rings between intake manifold and fluid caps.
S Check tightness of (6) diaphragm nut or (14) bolt.
Pump blows air out main exhaust when stalled on either stroke.
S Check U" cups on (111) spool in major valve.
S Check (141) valve plate and (140) insert for wear.
S Check (103) sleeve and (2) O" ring on diaphragm connecting rod.
S Check (119) O" rings on (118) pilot rod for wear.
Low output volume.
S Check air supply.
S Check for plugged outlet hose.
S For the pump to prime itself, it must be mounted in the vertical posiĆ
tion so that the balls will check by gravity.
S Check for pump cavitation Ć suction pipe should be 1/2" minimum or
larger if high viscosity fluids are being pumped. Suction hose must
be nonĆcollapsible type, capable of pulling a high vacuum.
S Check all joints on intake manifolds and suction connections. These
must be airtight.
S Check for sticking or improperly seating check valves.
S If pump cycles at a high rate or runs erratically, check (119) piston
O" rings for wear.
DIMENSIONAL DATA / 818830, 818834, 818837, 818838
Dimensions shown are for reference only, they are shown in inches and millimeters (mm).
4Ć7/8"
(124 mm)
11Ć5/8"
(295 mm)
11"
(279 mm)
5/16" Slot (8 mm)
7Ć11/16"
(195 mm)
6"
(152 mm)
5Ć1/2"
(140 mm)
2"
(51 mm)
6Ć1/8"
(156 mm)
Material Outlet
1/2 Ć 14 N.P.T.F. Ć 1
Air Inlet
1/4 Ć 18 P.T.F. SAE Short
Material Inlet
1/2 Ć 14 N.P.T.F. Ć 1
6Ć7/16"
(164 mm)
Figure 6