HG-CF-1184 Rev. C, 16/11/12 Page 7
TROUBLE SHOOTING GUIDE
NOTE :- Check all solutions before dismantling the pump.
PROBLEM CAUSE SOLUTION
Pump will not start Air valve assembly malfunction/Siezure
Obstructed fluid line.
Obstructed diaphragm chamber.
Diaphragm failure causing fluid & excessive air to be
expelled through the exhaust.
Diaphragm seal failure.
Air valve system malfunction.
Air connected to exhaust.
Check carrier for freedom of movement. -
Clean, re-grease & replace.
Clean line or increase line size.
Remove obstruction.
Replace diaphragm.
Replace shaft seals.
Check all seals in valve chest assembly.
Re-connect to air inlet.
Erratic flow Diaphragm failure on one side.
Valve ball not seating.
Suction leakage.
Diaphragm failure causing fluid & excessive air to be
expelled through the exhaust.
Diaphragm seal failure.
Air valve system malfunction.
Replace diaphragm.
Check and remove obstruction.
Check and correct.
Replace diaphragm.
Replace shaft seals.
Check all seals in valve chest assembly.
Pump strokes but will not
discharge
Excessive suction lift.
Suction line leakage.
Valve ball not seating correctly or damaged.
Suction line or strainer clogged.
Diaphragm failure.
Shorten suction line.
Check and correct.
Check and remove obstruction / replace.
Clear.
Replace diaphragm.
Fluid discharged from air
exhaust
Diaphragm Failure.
Loose frontplate.
Replace diaphragm.
Re-Torque to manual specifications.
Intermittent stroke rate Over lubrication
Diaphragm shaft seal failure.
Air valve system malfunction.
Valve ball not seating / partially obstructed.
Shut-down pump. Remove air connection
into pump & introduce a small quantity of de-
greasing agent into air valve and replace
line. Run pump until clear.
Replace seals.
Check all seals in valve chest assembly.
Clear obstruction.
The Atex approved units are supplied with a natural earth ground
cable. This cable is 2 meters in length and permanently connected
through a nut and bolt at the inner cover casting. The other end is free
to connect to the nearest available suitable point to provide a natural
earth ground. This must be done to reduce the risk of electro-static
sparking.
Grounding the pump :-
Take action to prevent static sparking. Fire or
explosion can result, especially when handling
flammable liquids. The pump, piping, valves,
containers or other miscellaneous equipment
must be grounded.
WARNING!
ATEX Certified units :- X2505AA.. These models are certified to :-
Non-electrical equipment for potentially explosive atmospheres : EN13463-1 : 2001, ‘c’ - Internal control of production.
II 2 GD c
ADDITIONAL PARTS FOR ATEX CAT. 2 PUMPS
REF
No.
PART
NUMBER
QTY
38 SA10288 GROUNDING LEAD 1
39 SP467 ATEX I/D TAG 1
DESCRIPTION
40 SP473 TIE-LOK TIE 1
(12 pages)
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