3-39. HIGH PRESSURE PUMP (R.O. PUMP) MAINTENANCE - continued.
Remove two thumbscrews (26) and cover (25).
Unscrew coupling nuts (21) on plungers (20) and, using gland adjustment tool as illustrated, loosen gland
Valve block is heavy/difficult to handle and must be supported while it is being separated from
pump assembly to prevent injury or damage to equipment.
Remove two nuts (23) and carefully separate fluid cylinder (10) from power frame (24).
Remove eight screws (8), cover (9), three caps (1) and O-rings (2).
Remove cap screws (3), valve guides (4), springs (5) and disks (6) on all three channels.
Using valve removal tool, remove valve seats (7) as illustrated.
Remove three gland nuts (19), plungers (20) and packing bushings (18).
As required, remove retaining rings (22) and nuts (21) from plungers (20).
Remove eight screws (15) and plate (14).
Remove stuffing boxes (27) and O-rings (28).
Remove packings (17) and packing bushings (16) from stuffing boxes (27).
Remove three capscrews (29), valve guides (30), springs (31 and 32) and discs (33).
Remove valve seats (34), using valve seat removal tool as illustrated.
If required, remove studs (13) and plugs (11 and 12).
Dry cleaning solvent PD-680 is highly toxic and can ignite organic materials, nitrates, carbides
and chlorates. Wear eye, skin and respiratory protection. Use in well-ventilated area.
Clean large parts (power frame, fluid cylinder, etc.) with rags and cleaning solvent.
Clean all small items (bearings, bolts, etc.) by dipping in cleaning solvent and allowing to air dry.