FAG PUMP 1000 Mode D'emploi page 7

1.5 Trouble shooting
P P I I S S T T O O N N w w i i l l l l n n o o t t a a d d v v a a n n c c e e
– the pump head is not downwards;
– the drain valve is open or not properly
closed;
– the system is leaking or lack of oil in the
pump;
– make sure the pump delivers any oil.
D D o o n n o o t t o o v v e e r r l l o o a a d d
– the piston will not advance if the load to
be lifted exceeds the capacity of the
cylinder in use. In this case the safety
valve protects the operator and the
equipment by preventing the advance.
T T h h e e p p i i s s t t o o n n d d o o e e s s n n o o t t m m a a k k e e f f u u l l l l s s t t r r o o k k e e o o r r
a a d d v v a a n n c c e e s s w w i i t t h h j j e e r r k k s s
– there is air in the system (eliminate as
per chp. 3).
– the piston could be bent or deformed
causing it to bind with the ring nut,
– there is lack of oil in the pump so the
piston is limited in its stroke. Refill the oil
level in the pump,
– the hydraulic cylinder's capacity is higher
than that of the reservoir. The pump must
be replaced with one with higher capacity.
T T h h e e p p i i s s t t o o n n d d o o e e s s n n o o t t k k e e e e p p t t h h e e l l o o a a d d
– possible causes:
a) the pump does not work properly
(the check valve is not tight).
b) cylinder seals leak.
c) oil leakage through the flexible hose
connection.
T T h h e e p p i i s s t t o o n n r r e e t t u u r r n n i i s s n n o o t t c c o o m m p p l l e e t t e e o o r r
s s l l o o w w e e d d d d o o w w n n
Note:
For gravity return cylinders it is necessary
to make an external force on the top of the
rod so as to make it retract.
– i.e. the oil cannot flow freely back to the
reservoir. Make sure that:
a) is the drain valve fully open?
b) are nipple and socket fully coupled?
c) the piston cannot be fully retracted
since there is too much oil in the
reservoir. Caution due to possible
bursting of the reservoir!
- close the drain valve.
- slowly open the vent screw in order to
relieve reservoir from pressure.
- fully unscrew the venting screw and
drain the oil.
- slowly open the drain valve.
- catch the oil that comes out.
O O i i l l l l e e a a k k a a g g e e
– if an oil leakage is found at the piston it
usually means the seals are worn out.
Seal replacement can be carried out on
site.
I I T T I I S S R R E E C C O O M M M M E E N N D D E E D D T T O O K K E E E E P P I I N N
S S T T O O C C K K A A S S P P A A R R E E R R E E P P A A I I R R K K I I T T F F O O R R T T H H E E
P P U U M M P P . .
GB
F F A A G G 5