MEGA Corp. MMP4-2 - Manual (Page 30)

MMP 4-2
5 Nov 2011
SECTION 5
Water Pump Assembly
5-7
DISASSEMBLY
Removal of the water pump assembly from the
inlet boom is necessary to properly service or
repair the water pump. The water pump
assembly is heavy (greater than 200 pounds or
91 kg). Use proper lifting devices and
techniques for this operation to preclude
personnel injury or death.
1. Place MMP4 on a firm hard packed, level
work surface.
2. Set and secure 3 landing gear legs.
3. Remove electrical power from unit.
4. Disconnect and cap hydraulic hoses from
water pump drive motor fittings.
5. Remove water pump from inlet boom.
6. Remove strainer by loosening (4) screws
(Item 14).
To inspect impeller (Item 20) remove (8)
bolts (Item 11) holding suction bowl
(Item13) to discharge bowl (Item 22).
7. Remove suction bowl and check impeller
and suction bowl face for excessive wear.
Replace if obvious wear is present or if
pump performance is poor.
8. To inspect hydraulic motor (Item 1) upper
bearing (Item 27) and upper seal (Item 26),
use the following procedure:
9. Remove hydraulic pipes (Item 5) from
drive motor.
10. Remove (8) bolts (Item 8) holding
discharge bowl to discharge pipe (Item 2).
11. Remove discharge pipe assembly.
Remove (4) bolts (Item 33) holding
hydraulic motor to bearing housing (Item
7).
12. Remove and inspect hydraulic motor.
13. Inspect motor O-Ring (Item 31) and replace
if necessary.
14. Drain oil from bearing housing by tilting
unit on side and removing drain plug (Item
s 23, 34 and 40). Inspect condition of oil.
If oil is low or is emulsified with water, the
upper seal should be replaced (Item 26).
15. Remove snap ring (Item 29) near end of
shaft (Item 24).
16. Remove shaft collar (Item 6) by loosening
set screws on collar by inserting the
appropriate Allen wrench through the oil
plug hole in the bearing housing.
17. Remove bearing housing by lifting straight
up (bearing will remain in housing).
18. Remove snap ring (Item 28) and slide
bearing (Item 27) out of housing. Inspect
for rough spots and replace if necessary.
19. Inspect lower O-Ring (Item 35) and upper
shaft seal for damage or wear, replace if
necessary.