26
308–530
PUMP SERVICE (Model 1535)
Servicing the Valves
Disassembly:
1. Remove the four (4) socket head bolts and spring
washers from end of manifold.
2. Support the discharge manifold from the underside
and tap with a soft mallet to separate from the inlet
manifold.
3. Carefully place discharge manifold on working
surface with valve chambers up.
4. From the three (3) smaller diameter and shallow inlet
chambers remove the inlet valve adapters with inner
and outer o–rings. These adapters are not held
securely in position and may fall out as the discharge
manifold is removed.
5. Next remove the valve seats, valves, springs and
retainers from the inlet chambers.
6. From the three (3) larger diameter and deeper
discharge chambers remove the discharge valve
spacers with o–rings. These brass spacers generally
remain with the discharge manifold as it is removed.
A reverse pliers fitted into the center bore and
hooked onto the side ports of the spacer will assist
the removal.
7. Next remove the valve seats, valves, springs and
retainers from the discharge chambers.
NOTE:
The inlet and discharge use the same
retainers, springs, valve seats and valves. The
o–rings and valve spacers/adapters are
different. Keep parts in order as they are
removed.
Reassembly: (DISCHARGE)
1. With crankcase side of discharge manifold facing up,
insert the springs into the retainers over the plastic
center guide.
2. Place valve spring retainers in deeper valve
chambers. They will rest on the machined ridge in
each chamber.
3. Examine the valves for wear or pitting and replace if
necessary. Install valves over the springs with
recessed (dish) side down.
4. Examine valve seat o–rings for wear and replace.
Lubricate and place o–rings on lip of retainers.
Carefully square o–rings in valve chamber to avoid
cutting o–ring when valve seat is installed.
5. Examine valve seats for pitting, scale or ridges and
replace if necessary. Install valve seat with grooved
side down, so o–ring fits snugly into groove on seat.
6. Examine both o–rings on the discharge valve spacer
and replace if necessary . Lubricate o–rings and fit
into grooves on outside of spacer.
7. Lubricate spacer and carefully press into valve
chambers with small diameter side down until spacer
snaps tightly into position.
Reassembly: (INLET)
1. Place valve spring retainers into the shallow valve
chambers. They will rest on the machined ridge in
each chamber.
2. Insert valve springs into retainers over plastic center
guide.
3. Inspect the valves for wear , ridges or pitting and
replace if necessary. Insert valves over the springs
with recessed (dish) side down.
4. Examine valve seat o–rings for wear and replace.
Lubricate and place o–rings on lip of retainers.
Carefully square o–rings in valve chamber to avoid
cutting o–ring when valve seat is installed.
5. Examine valve seats for pitting, scale or ridges and
replace if necessary. Install valve seat with grooved
side down, so o–ring fits snugly into groove on seat.
6. Examine the adapter inner o–rings and replace if
worn. Lubricate and install o–rings into inlet valve
adapters.
7. Examine the adapter outer o–rings and replace if
worn. Lubricate and install o–rings onto inlet valve
adapters.
8. Lubricate inlet valve adapter and press into chamber.
Carefully square inlet valve adapter into chamber to
avoid cutting or extruding o–ring.
9. Replace discharge manifold over plunger ends
matching discharge valve spacers with inlet
chambers and press into position. T ap with a soft
mallet until completely seated in chambers.
10. Replace all four (4) washers and socket head bolts.
Hand tighten each. Then torque per chart.
Servicing the Seals
Disassembly:
1. With discharge manifold removed from the pump
remove the two (2) socket head bolts and spring
washers from end of inlet manifold.
2. Rotate crankshaft to loosen inlet manifold.
3. Support inlet manifold from underside and tap with a
soft mallet to separate manifold from crankcase.
