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NOTE: On multiple stage pumps, or when cleaning,
checking or changing stator (30), rotor (40), and/or gear joint
assembly, one of the following procedures is suggested for
removing the stator.
Method 1: Utilize Moyno’s Hydraulic Stator Removal Device
(SRD). See separate SRD service manual or contact the
local Moyno distributor for further information on this new
product.
Method 2: Use winch-type device anchored directly opposite
stator end. Attach cable to discharge flange (37) to pull
stator (30) off rotor (40).
Method 3: Remove stator (30), rotor (40) and connecting
rod (38) as a single unit (See Section 4-13). Place the stator
(30) in an upright position on the discharge flange (37).
Remove rotor (40) and connecting rod (38) from the stator
(30). It may be necessary to use a chain or sling with a
lifting device. Anchor discharge flange (37) securely to the
floor before lifting.
Method 4: Hold stator (30) with pipe or strap wrench and
turn drive shaft had (4) clockwise to unscrew stator (30) from
rotor (40).
5. Remove discharge flange by unbolting from stator
clamp ring (36B) and remove stator gasket (34).
Remove stator retaining ring (35) and stator clamp ring
from stator (30).
6. Check rotor (40) and stator (30) for wear. See Sections
(4-21) and (4-22) for instructions.
4-12. Drive End Gear Joint Removal
1. Complete Section 4-9.
2. Remove drive coupling or V-belts and pulley from drive
shaft head (4).
3. Remove vent plugs (C) from drive shaft head (4) and
drive shaft (14). Remove set screw (D) from drive shaft (14).
Remove six socket head screws (E) from drive shaft head
(4) and remove drive shaft head. Remove primary thrust
plate (6) from drive shaft head and remove two keys (7).
4. Remove lock nut (9) from end of connecting rod (38).
Remove ring gear (8), gear ball (10), secondary thrust plate
(11), seal support (12), and gear joint seal (13).
Note: It is recommended that each time the drive end gear
joint is disassembled, the drive shaft O-ring (5) and
gear joint seal (13) should be replaced.
4-13. Rotor and Connecting Rod Removal
1. Complete Sections 4-9, 4-11 and 4-12.
2. Pull the rotor/connecting rod assembly from the pump.
Remove the vent plug (C) and set screw (S) from the gear
joint shell (39).
3. Remove six socket head screws (T) from head ring (42)
and remove head ring and O-ring (41). Slide connecting rod/
gear joint assembly off rotor head. Remove gear joint keys
(7) and primary thrust plate (6) from rotor (40).
4. Slide gear joint shell (39) off gear ball/connecting rod
assembly. Slide ring gear (8) off gear baIl (10).
5. Clamp connecting rod (38) in vice or hold with pipe
wrench and remove lock nut (9). Remove gear ball (10), sec-
ondary thrust plate (11), seal support (12), and gear joint
seal (13) from connecting rod.
Note: It is recommended that each time the rotor end gear
joint is disassembled, the rotor head O-ring (41) and
gear joint seal (13) should be replaced.
4-14. Drive Shaft and Bearings Removal
Note: If the space immediately in front of the pump is unob-
structed for a distance equal to the length of the drive
shaft, follow steps 1 through 3.
1. Complete Sections 4-9 and 4-12.
2. Remove six hex head screws (A) from bearing cover
plate (2). Slide bearing cover plate (2) with radial grease seal
(1) and O-ring (3) off drive shaft.
3. Pull drive shaft/bearing assembly out of bearing
housing, taking steps to support the weight of the assembly
as the bearings clear the housing. Remove grease seal (19)
from the bearing housing.
Note: If the space in front of the pump is obstructed, and the
obstruction is not easily moveable, follow steps 4
through 6.
4. Complete Sections 4-10 and 4-11, and pull the rotor/
connecting rod assembly from the pump.
5. Remove the four cap screws (0) from the clamp ring
(28), and the four cap screws fastening the bearing Housing
(26) to the base. Slide the bearing housing/shaft assembly
out of the suction housing until the quill clears the stuffing
box. Assembly may now be turned or removed to an area
where sufficient space is available to permit removal of the
shaft/bearing assembly.
Note: Some pumps have a sleeve installed on the drive
shaft to receive any possible wear caused by the
packings. (See fig. 4-10.) To remove sleeve, refer to
Section 4-47.
CAUTION: The bearings are pressed on the shaft during
assembly. Care must be taken during
disassembly to avoid damaging the bearings
or shaft.
6. Remove bearing lock screw (17) from bearing nut (18).
Using suitable spanner wrench or soft punch and hammer,
thread lock nut off drive shaft. Do not use a pipe wrench to
remove the lock nut.
7. Remove both halves of bearing spacer (16) from shaft,
and using suitable bearing press and adapters, press bear-
ings off shaft.
4-15. CLEANING
Clean all parts in a suitable cleaning solvent being careful
to observe all safety precautions regarding the use of
solvent.
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