Wilkerson RB3 - Manual (Page 2)

Service
! CAUTION: SHUT OFF AIR SUPPLY and exhaust the
primary and secondary pressure before disassembling
regulator unit. (Turning the knob counterclockwise
reduces regulator’s setting, but does not vent
downstream pressure on non-relieving regulators.)
! CAUTION: Lubricate parts with a mineral based
grease / oil or silicone grease. DO NOT use synthetic
grease / oils such as esters.
A. Servicing the Bonnet and Diaphragm Assembly-
1A. On RB3, disengage the adjusting knob by pulling upward.
Turn adjusting knob counterclockwise until the compression
is released from the pressure control spring.
1B. On tamper resistant models, do not adjust the unit. Use
caution when removing the bonnet.
2. Unscrew the threaded bonnet assembly. Next, disassemble,
clean, and carefully inspect parts for wear and/or damage.
If replacement is necessary, use parts from service kits.
3. Install diaphragm assembly into body. Then install bonnet
assembly to body. See Figure 1 for torque value.
B. Servicing the Poppet Assembly-
1. Exhaust system air pressure as previously described. Then
remove bottom cap by unscrewing it from body. Next,
remove cap and o-ring, spring and poppet assembly.
2. Next, clean, and carefully inspect parts for wear and/or
damage. If replacement is necessary, use parts from service
kits.
RB3 Brass Regulators 84-036-000
3. Lubricate o-ring and sliding surfaces using grease supplied
with service kit.
4. Lubricate cap’s o-ring and install it in o-ring groove on cap.
Then screw cap into body until the cap bottoms out in
body. See Figure 1 for torque value.
5. Turn on air supply and adjust to desired secondary pressure
as described in the Operation section.
Turn on air pressure and check regulator for leakage. If leakage
occurs, DO NOT OPERATE — conduct repairs again.
If you have questions concerning how to service this unit, contact
your local authorized dealer or your customer ser vice
representative.
Service Kits Available
Description RB3 Brass
Bonnet Assembly RRP-96-821
Tamper Resistant Kit RRP-96-822
Knob Only Kit RRP-96-823
Regulator Repair Kit
(Relieving)
RRP-96-824
Regulator Repair Kit
(Non-Relieving)
RRP-96-825
Lightly grease with provided lubricant.
Inspect for nicks, scratches, and surface imperfections. If present,
reduced service life is probable and future replacement should
be planned.
Clean with lint-free cloth.
Figure 1
RB3 Regulator
(Non-Relieving Shown)
Knob
Adjusting Screw
Drive Nut
Control Spring
Spring,
Poppet Return
O-Ring,
Bottom Cap
Diaphragm Assembly
(Includes Upper Diaphragm Plate
& Lower Diaphragm Plate
Bottom Cap
Torque:
3.5 to 5.1 Nm (35 to 45 in.lb.)
Poppet
Assembly
Body
Bonnet - Torque:
4.5 to 5.6 Nm (60 to 70 in.lb.)