9
H.2 TOOLS REQUIRED
Procedures described in manual require common mechanics hand tools, a torque wrench, dial
indicators for alignment and a suitable lifting device such as slings, straps, etc.
H.3 PUMP DISASSEMBLY PROCEDURES:
NOTE: _
G3D_-350_ and 400 pumps incorporate highly finished precision parts that must be
handled carefully to avoid damage to critical machined surfaces. Parts removed
should be tagged for identification and their exact positions in pump carefully noted so
new parts, or same parts, are properly replaced without damage.
CAUTION
Fluid leakage from disassembly of pump may make floor slippery and can cause personal injury
SPECIAL NOTE:
To service mechanical seal and ball bearings ONLY perform H.3, Steps 1
through 5 and
H.4, Steps 7thru 11 Only.
Determine pump model identification identified on pump nameplate to select applicable pump
assembly shown in Figure 4 through 7. Refer to that assembly for following instructions.
1. Close suction and discharge piping to pump. Vent pressure from pump. Disconnect
piping. Remove drain plugs (5 or 32) or seal tubing (35, 36, 57, 42, 71, 79) on C-face
pumps, and drain unit. Remove pump from driver, coupling and base plate. Remove
coupling hub and key (16 or 31).
2. Remove bearing retainer (17 or 43) from inboard cover (9 or 46) by removing bolts (18 or
47) (and lockwashers (30) if present).
3. Remove assembled power rotor (11 or 63) from inboard cover (9 or 46). Removal of
power rotor (11 or 63) includes removal of snap rings (13 or 42), ball bearing (15 or 49),
seal spacers (14 or 48), and mechanical seal (25).
4. Disassemble power rotor (11 or 63) as follows:
a. Using a flat nosed tool, such as a screw driver, remove snap rings (13 or 42) from
groove in power rotor (11 or 63) on both sides of ball bearing (15 or 49).
b. Sealed ball bearing (15 or 49) is assembled to power rotor (11 or 63) with light press
fit. Ball bearing (15 or 49) may be removed by using bearing puller or vertical arbor
press. When using press, place two pieces of key stock through openings of
mechanical seal seat adapter (14 or 48) underneath ball bearing (15 or 49) on both
sides of power rotor shaft. Key stock should be long enough to support power rotor
(11 or 63) as it is placed in press. Position press ram against power rotor (11 or 63)
coupling end face. Gently press power rotor (11 or 63) through ball bearing (15 or 49).
Ensure power rotor (11 or 63) does not fall to floor once ball bearing (15 or 49) is off of
its diameter.
c. If pump has no seal (DKH design in figure 4 or 6), power rotor disassembly is
complete. Remove spacer (14 or 48) and skip to step 6. If pump has mechanical seal,
proceed with step (d).
