Liquiflo
Installation, Operation & Maintenance Manual
Max
®
Series Sealed Pumps
Models M2 thru M8
5.4 Pump
Assembly
Follow the procedure below and refer to the Exploded View Drawing on Page 12 for Models M2-
M4 or Page 13 for Models M5-M8.
1
Assemble the drive gear (21) to the drive shaft (19) using the gear key (22) and two
retaining rings (10). Assemble the idler gear (6) to the idler shaft (1) using the gear key
(22) and two retaining rings (10). (Note: This step is not applicable if the gear-shaft
components were supplied as part of a repair kit or as integral 17-4 PHSS material. The
drive gear has a left hand helix and the idler gear has a right hand helix.)
2
Insert bearing lock pins (25) into the front housing (8) and rear housing (2).
3
Insert bearings (3) into the front and rear housings. (Note: Bearings have a slip-fit
design and should easily slide into the bearing bores.)
4
Insert two housing alignment pins (23) into the rear housing.
CAUTION! Do not reuse O-rings.
5
Insert housing O-rings (5) into the circular grooves of the center housing (20).
6
Place center housing onto rear housing and insert two wear plates (7). (Note: The wear
plates have relief grooves to minimize hydraulic separation forces. These relief grooves
must face the gears to operate properly.)
7
Insert the idler and drive gear-shaft assemblies into the center-rear housing. (Note: The
drive shaft is located on the pump’s centerline.)
8
Place the other two wear plates (7) into the center housing with the relief grooves facing
the gears.
9
Insert two housing alignment pins (23) into the center housing.
10
Bolt the front housing (8) to the center-rear housing using the housing bolts (4). (Note:
Models M2-M4 require four housing bolts; Models M5-M8 require eight housing bolts.)
CAUTION! Do not reuse O-rings.
11
Insert O-ring (17) into groove on the stationary seal seat (16). (Note: Lubricate O-ring
with a compatible lubricant such as vegetable oil. This will facilitate installation of the
seal seat into the seal housing.)
12
Press seal seat with O-ring into the seal housing (11).
CAUTION! Do not reuse O-rings.
13
Place O-ring (18) onto the seal housing.
9
