12
For steps (b) – (e), refer to figure 3, mechanical seal drawing.
b. If seal is a single spring type rubber bellows type, apply light coat of system fluid to
inside diameter of bellows and slide mechanical seal rotating assembly on power rotor
(11 or 63) until it seats against the shoulder of seal spacer (38). Wipe seal face with
isopropyl alcohol and a lint free rag.
c. If seal is a multi-spring seal, coat O-ring inside of rotating seat with system fluid and
slide mechanical seal rotating assembly on power rotor (11 or 63) until it seats against
the shoulder of seal spacer (38). Tighten rotating seat set screw. Wipe seal face with
isopropyl alcohol and a lint free rag.
d. If seal has a “J” type seat, clean it with isopropyl alcohol and a lint free rag. Then put
a small amount of clean system fluid or light oil on its running face and install the
running face against the stationary seat face.
e. If seal has O-ring type stationary seat, install O-ring in groove of mechanical seal
stationary seat. Install seat including O-ring in seal seat adapter (14 or 48) ensuring
that groove in back of stationary seat mates to spring pin in seal seat adapter (14 or
48). Clean seal face with isopropyl alcohol and a lint free rag. Put a small amount of
clean system fluid or light oil on seal running face. Install the rotating ring running face
against the stationary seat face.
f. Install inner snap ring (13 or 42) in groove of power rotor (11 or 63).
g. Press bearing (15 or 49) on power rotor (11 or 63), pressing only on inner race of ball
bearing (15 or 49) using an installation sleeve until it is located next to inner snap ring
(13 or 42).
CAUTION
ATTENTION
Ball Bearing (49) will be damaged if installed by pressing on outer race.
h. Install outer snap ring (13 or 42) in groove of power rotor (11 or 63).
9. Install gasket (44 or 83) in inboard cover (9 or 46). Gasket may come with replacement
seal. Gasket (44 or 83) not required with DHK pump (see assembly drawings 4 and 6)
10. Install assembled power rotor (11 or 63) in pump, centering all parts as they enter inboard
cover (9 or 46). Align one of openings in spacer (14 or 48) over drain in inboard cover (9
or 46).
11. Install bearing retainer (17 or 43) on inboard cover (9 or 46) using bolts (18 or 47) (and
lockwashers (30) if present). Torque bolts (18 or 47) to value on assembly drawing
12. Install idlers (19 or 21) into housing (2 or 24) by meshing threads with power rotor thread.
13. If idler cup design, install cups (20 or 23) on idlers (19 or 21).
14. Install spacer (43 or 50) on suction end of case (1) flush with edge of housing (2 or 24).
15. Install bolts (23 or 53) and lock washers (24 or 52) in thrust plate (21 or 29). Install
spacers (22 or 51) on bolts (23 or 53).
