SERVICING THE UNLOADER AND REGULATOR
1DX015ELS.MIST, 1DX03ELS.MIST - Integral Regulator
2DX, 3DX, 3DNX, 3SPX - Integral Unloader
2DX.MIST - Integral Regulator
3SP - 7700 Modular Unloader (refer to individual data sheet)
Disassembly
NOTE: On models 3SP30G1I, 3SP35G1I, 3SPX30G1I
and 3SPX35GEI remove black adjusting handle.
1.
Remove brass adjusting cap by turning in a counterclock-
wise direction.
2.
Remove exposed coil spring and flat spring retainer.
3.
Use an M19 wrench to remove piston retainer by turning
in a counterclockwise direction.
NOTE: The piston stem and valve assembly may fall out
when the piston retainer is removed. If so, proceed to step
6., if not, continue with step 4.
4.
Use a needle nose pliers to remove piston stem and valve
assembly.
5.
Separate piston stem from valve. Secure the valve near
the valve retainer. Insert a screwdriver into slotted head of
piston stem and unthread from valve.
CAUTION: Exercise extreme caution to avoid contact and
damage to the tapered surface of valve.
6.
Examine seat at the bottom of the unloader chamber for
grooves, pitting or wear, replace only as needed.
CAUTION: Seat will be damaged when removed.
Reassembly
1.
If seat is worn or damaged, press new seat into unloader
chamber until squarely seated.
2.
Examine piston stem, washer, valve retainer and valve for
grooves, pitting or wear and replace as needed. Examine
o-rings and back-up ring for cuts or wear and replace as
needed.
3.
Lubricate and install o-ring over slotted head of piston
stem, then position back-up ring on top of o-ring.
4.
Lubricate and install o-rings on valve retainer.
5.
Install washer and then valve retainer with o-rings onto
piston stem. Apply Loctite® 242® to threads of piston
stem and screw valve onto piston stem.
6.
Lower complete piston stem and valve assembly into
unloader chamber with valve facing downward.
7.
Examine piston retainer for damaged threads or wear and
replace as needed. Examine o-ring for cuts or wear and
replace as needed.
8.
Apply Loctite® 242® to threads and then hand thread piston
retainer into unloader by turning in a clockwise direction,
and then tighten with wrench.
9.
Examine spring retainer and coil spring for fatigue or
breaks and replace as needed.
10. Place spring retainer into piston retainer, followed by coil
spring.
11. Thread brass adjusting cap onto piston retainer by turning
in a clockwise direction.
Loctite and 242 are registered trademarks of Henkel Corporation.
