Mega MMP4, Maintenance Manual

Page: 25 / 96

MMP4-CAT(T4)-MX-2
26 Feb 2014
SECTION 5
Water Pump Assembly
5-6
26. Remove shaft key (Item 19) and gently slide shaft
out of discharge bowl toward drive end.
27. Inspect lower shaft seal (Item 21) and replace if
necessary.
28. Inspect shaft and bronze discharge bowl bushing
(Item 10) and replace if worn. (Moderate wear
[e.g: shiny areas or ridges not more than 0.010
inch (0.254 mm) deep] on shaft are acceptable,
the upper bearing takes most of the loading).
29. Inspect bushing (Item 12) in suction bowl (Item
13) and replace if worn.
ASSEMBLY
1. Assembly is performed in reverse order of
disassembly:
2. Ensure O-Rings are properly installed in grooves
(Items 31 and 35).
Use only clean grease when assembling new seal
on shaft and when installing new seal seat in
bearing housing. Apply a light film of clean oil to
seal faces when assembling to prevent scratching
surfaces. (Extreme care and cleanliness must be
used when installing shaft seals to prevent
possible component damage). Failure to keep
items clean and use clean grease to perform this
function may result in seal, bearing or shaft
damage.
The following is the required filling procedure for
the bearing reservoirs when the pump is in a
vertical position resting on the inlet end:
3. Fill suction bowl bushing area to bottom of
bushing with waterproof grease.
4. Fill oil hole (1/2 inch pipe plug) in discharge bowl
(Item 22) to spill point (pump in vertical position)
with clean hydraulic oil. Refer to line 5 above for
oil specifications.
5. Fill oil hole (1/4 inch plug) in upper bearing
housing (Item 7) to spill point with clean
hydraulic oil. Refer to line 5 for above for oil
specifications.
6. Use anti-seize compound on all threaded
fasteners when re-assembling pump.
Do not use anti-seize on seals or bearings. If an
anti-seize compound is used in this application
bearing and/or seal failure will result.
7. Ensure pressure and return pipes are connected
to proper ports on the hydraulic motor.
8. Install strainer to pump inlet, tightening (4)
retaining bolts (Item 14).
9. Inspect mounting gasket for damage, replace as
necessary.
10. Install pump assembly to suction pipe, tighten
fasteners.
11. Hook up hydraulic hoses.
12. Check hydraulic fluid level, adjust level as
required.
13. Check to ensure hydraulic pump inlet valve is
OPEN.
PRESSURE
RETURN