TEST PROCEDURES
(Refer to Figure 1)
After repair is complete, test the regulator in the following
manner:
1. Set air and fluid regulators to zero and attach air and
fluid lines to the regulator.
2. Gradually increase air pressure to the regulator to 80
psi, visually checking for leaks. Tighten Item 4 (screws)
if leakage occurs.
3. Set air regulator to zero. Gradually increase fluid pressure
to 80 psi, visually checking for leakage. Clean or replace
Item 11 (needle and seat) if leakage at outlet port.
PREVENTIVE MAINTENANCE
1. Rebuild with 73913, Repair Kit, and 74160-00, needle
and seat, at 6 months minimum, 12 months maximum.
2. Re-torque eight (8) screws at the following intervals:
• 2 days after rebuild
• Immediately before installation
• 6 month intervals
4. Gradually increase air pressure on either of the air
lines and visually observe a gradual increase in fluid
flow. If regulator does not perform satisfactorily, inspect
components for damage and replace where required.
16. Tighten opposing screws alternately to 10 lbs•in, ensur-
ing uniform sealing of the diaphragms. Then follow by
tightening each screw in a circle pattern to 20 lbs•in.
17. If Item 15 (air fittings) were removed from either Item
2 (spacer ring) or Item 1 (cap), screw them along with
Item 18 (gasket) back onto these items.
CAUTION
!
DO NOT
overtighten the air fittings. Overtightening
the fittings may cause the stem of the fitting to snap off.
NOTE
If water or solvent is used for testing, it is normal
for minor leakage to occur at the fluid output port, due
to the low viscosities of these fluids.
LN-9223-00-R12 (04/2018)
15 / 22
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MAINTENANCE
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