Troubleshooting guide

13
72-001-02 Rev A
Use lubricating oil different than suggested is permitted only if the characteristics are compatible/equivalent. Use
mineral oil for gears with a ISO VG 320 viscosity index (320 cSt at 40 °C or 23 °E at 50 °C)
The MD series holds 400mL of oil (approximately ½ quart)
Suggested oils.
OIL
MAKE
OIL
TYPE/NAME
SHELL
OMALA OIL
320
ESSO
SPARTAN EP
320
MOBIL
MOBILGEAR
632
IP
MELLANA OIL
320
AGIP
BLASIA 320
6.2 Wet End Removal, Inspection, & Reinstallation
IF THE DIAPHRAGM HAS FAILED, PROCESS FLUID MAY HAVE CONTAMINATED THE PUMP
ECCENTRIC HOUSING (ALTHOUGH NORMALLY, ANY PROCESS FLUID BEHIND A FAILED
DIAPHRAGM WOULD PASS THROUGH THE BOTTOM DRAIN HOLE). HANDLE WITH APPROPRIATE
CARE.
6.2.1 Diaphragm Removal & Reinstallation
Rupture of the diaphragm is usually caused by excessive pressure and/or handled fluid under
high temperatures.
The mechanical diaphragm lifespan is related to the actual working conditions of the pump:
- over 20.000 hours, for intermittent service (12/24 hours)
- 10.000 operating hours, with continuous service (24/24 hours)
The values are estimates and may differ depending on actual pump service conditions.
The disassembly and replacement of pump head and diaphragm instructions are the same for all
pump models
NOTE: BEFORE starting to disassemble, make sure there is no pressure or high temperature
in the pipeline !
 Release the pump from suction and discharge pipeline, and clean adequately
 Disassemble both valve units from the pumphead
 Unscrew all pumphead locking screws (item# .29) then remove the head body (item#21)
 Unscrew the mechanical diaphragm (item#32) by turning it in anti-clockwise direction