Caution – FMI STH/Q User Manual
Page 4
With the Pump/Drive Assembly removed from the
instrument and the piston/cylinder group removed
(MAY REQUIRE PUMP RECALIBRATION):
b) If the pump is severely frozen then the piston/cylin-
der group must be removed from the pump. Remove
the (2) screws that secure the H435 Cap to the pump
base assembly and carefully remove (twist, tilt & pull)
the piston/cylinder group from the pump base assem-
bly.
c) Soak the piston/cylinder group in warm water for
20 minutes minimum. For quickest results use an
ultrasonic bath. Then try to loosen up the assembly by
hand - gently rotating the piston back and forth until
free.
CAUTION:
Do not pull piston out of cylinder or force the
piston as breakage or seal damage will occur.
d) Reassemble the piston/cylinder into the pump
base assembly (use FMI Instructions H431) page # 8
section # 22 for more details relative to installing the
piston/cylinder assembly.
e) Reinstall H435 Cylinder Cap and apply a suitable
thread lock to the screws (Loctite # 425) and secure
screws (torque to 9 in-lbs).
f) Rotate the assembly to assure it moves smooth
and free. (If not see note #1 below).
g) Check the pump for proper calibration (If out of
specification see note #1 below).
Note#1:
Please return complete pump/drive unit to the fac-
tory for rework and
recalibration
IN-ST431-14
4
CAUTION
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as shown
H435 Cap
Screws(2)
Tighten to
9 in-lbs torque
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