22
RELIEF VALVE SUBASSEMBLY IS
REMOVED FROM THE PUMP.
Disassembly
1. Remove plastic plug (Item 249) which covers
relief valve and using 5/32” hex wrench los-
sen adjustment screw to remove pressure on
spring.
2. Unscrew and remove relief valve
subassembly.
3. Using a 5/32" hex wrench, remove
adjustment screw (Item 250) and dump out
spring (Item 260), ball holder (Item 280) and
ball (Item 300). The ball will probably stick
inside ball holder—if this is the case, keep
parts together. Do not separate sleeve (Item
290) from seat (Item 280).
4. Remove O-ring (Item 310) from bottom end
of cartridge.
5. Clean all components with an appropriate
solvent. Contact Milton Roy Company for a
recommended solvent. Inspect all parts and
replace them if they are worn.
Reassembly
1. Insert ball (Item 300) into ball holder (Item
270). Slide ball holder onto spring (Item 260).
2. While holding spring vertical such that ball
and ball holder are on top, slide sleeve
subassembly—consisting of components
280 and 290—over ball holder and spring.
3. Flip subassembly over and insert adjustment
screw (Item 250). Using a 5/32" hex wrench,
tighten adjustment screw until it clears notch
in sleeve.
4. Insert O-ring (Item 310) into end of seat
(Item 280).
5. Insert relief valve subassembly into pump,
and using a flat head screwdriver tighten it
snugly.
6. Follow adjustment procedure (Paragraph
3.2).
4.8.8 Relief Valve XW, Figure 14
LOSSEN THE BRASS ADJUSTMENT
SCREW SO THAT PRESSURE IS
REMOVED FROM THE SPRING
BEFORE THE RELIEF VALVE SUBAS-
SEMBLY IS REMOVED FROM THE
PUMP.
Disassembly
1. Remove plastic screw plug when required
and using a 5/16” hex wrench loosen brass
adjustment screw to remove pressure on
spring.
2. Unscrew and remove relief valve
subassembly.
3. Using a hex wrench, remove brass
adjustment screw (Item 50) and dump out
spring (Item 40) and poppet (Item 30). The
seat (Item 255) is pressed in to the bottom of
the sleeve (Item 254), keep parts together.
Do not separate sleeve from seat.
4. Remove O-ring (Item 256) from bottom end
of cartridge.
5. Clean all components with an appropriate
solvent. Contact Milton Roy Company for a
recommended solvent. Inspect all parts and
replace them if they are worn.
Reassembly
1. Insert poppet (Item 50) and spring (Item 40)
into sleeve (Item 254).
2. While holding spring vertical insert brass
adjustment screw and just start screw.
3. Insert the O-ring (Item 256) into end of seat
(Item 255).
4. Insert relief valve subassembly into pump
and using a adjustable wrench tighten it
snugly.
5. Follow adjustment procedure (Paragraph 3.2).
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