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.

￿6 308–530

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Graco Inc 800-698, 800-700, 800-699, 308-530 manual Pump Service Model, Servicing the Valves, Servicing the Seals
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800-700, 308-530, 800-698, 800-699 specifications

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