AW Gear Meters SRZ-100 - Manual

AW Gear Meters 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
REV. 05/24/12 SRZ-100.DOC
SRZ-100 Helical Flow Meter Maintenance Guide
Disassembly Procedure - Refer to the attached drawing #SRZ1902.
Never pry any housing components apart with a chisel or screwdriver. There are delicate
carbide shafts inside this unit - to avoid damaging these parts lay the unit horizontally on a
flat table or bench and follow the procedures below.
First remove the sensor (13) by releasing the locknut and removing the sensor from the flowmeter
housing. Next relax the six hex head bolts (2) at the sensor end (6) with a 8mm Allen hex key.
Remove four of the six bolts but keep two opposing bolts engaged by a few threads. With the
flowmeter laying on its side on a table, hold the upper housing at the sensor end (6) and gently tap
on the two bolts alternately with a hammer until the housing parts (6) & (7) separate. Remove the
last two bolts and ease the two flowmeter sections fully apart. NOTE: Carefully slide the upper
housing (6) straight off until it is completely clear of the gears (8) so as not to break the gear
shafts. With the housing separated, remove the helical gears (8), the sleeve bearing (11), and the
sleeve (10) by lifting the gears straight out of the housing. Check that the ball bearings (9) do not
fall out. Unscrew the remaining housing bolts (1) and remove the inlet housing (5).
Reassembly Procedure - Refer to the drawing
Check the condition of the 2 o-rings (3), replace them if any deterioration is noticed. Set housing part
(7) down with the inlet side pointing up. Check that the o-ring is seated snugly and screw the inlet
housing (5)on hand tight - make sure the index marks on the housing parts line up. Check that the
other o-ring (3) is also fitted snugly in its groove. Next set housing part (6) down on a table with the
locating pins (4) pointing up. Insert the larger helical gear, including the donut bearing (8a), into the
opening with the tooth gear end going first - press the donut bearing into the hole as well. Raise the
gear (8a) until the spacer sleeve (10) can be placed into the same hole above the donut bearing.
Press down the sleeve (10) until it sits flush in the housing (6) - make sure the sleeve is turned so
that it does not close off the opening inside the housing. Place the sleeve bearing (11) into the other
opening and set it flush with the housing. If necessary, lift the larger gear (8a) slightly to get sleeve
bearing (11) into its opening. Insert the smaller helical gear (8b)into the sleeve bearing (11) making
sure the two helical gears mesh with each other. Turning the gears will help. Next, lay the housings
(6 & 7) sideways on a table, match the holes in housing (7) with the gears and carefully slide the
housing (7) over the helical gears. Make sure to slide the housing on straight without any
twisting to avoid stress on the shafts. Insert two opposing bolts (2) and alternately tighten each
down until the two housing parts (6 & 7) are together. Insert and tighten down the remaining four
bolts with the 6 mm allen hex key. If the parts are reassembled correctly, a snug hand tight torque
will provide a sufficient seal. Reassembly should not require use of a vise.
FOOTNOTE: The use of thread seal tape or pipe dope on the fluid fittings should be avoided as pieces may
enter the meter. It is not recommended that the meter be operated or flushed with water. Should this occur,
residual water should be removed with alcohol and the internals oiled. If the device is to remain inoperative for
any extended period it is recommended that the internals be oiled.