3 - Wacker Neuson Group

PT / PG / PD REPAIR PT SERIES PUMPS 3
3.21 Pump Seals (cont.)
Recommended tools:
Socket wrench - 1/2" (13mm)
Allen wrench - 1/4", 5/16", 3/8"
Removal:
1. Remove impeller (1). See Section 3.20 Impeller.
2. Pull mechanical seal (2) off impeller.
3. Remove key (3) and washer(s) (4) from engine shaft.
Note: The quantity of washers may vary between pumps.
When removing washers, note their position and quantity
on engine shaft to ensure that they will be reinstalled
correctly.
4. Remove four screws (5) and washers (6) mounting
the pump housing (7) to the engine. Remove pump
housing.
5. Remove shaft seal (8) from rear of pump housing.
6. Press stationary half of mechanical seal (9) out from
pump housing.
7. Remove sleeve (10) and any remaining washers
from engine shaft for inspection or replacement.
Installation:
CAUTION: When handling and installing the mechanical
seal, it is important to keep hands and tools clean and
to avoid touching or pressing on seal faces.
1. Grease shaft seal (8) using Shell Alvania #2 or
equivalent. Press seal with open end facing into pump
housing (7).
2. Slide sleeve (10) over engine shaft. Be sure to
replace any washers that were removed.
Note: If the quantity or position of the washers are in
doubt, install sleeve with one washer on either side.
3. Press stationary half of mechanical seal (9) into pump
housing.
4. Slide pump housing over engine shaft being careful
not to cut lip of shaft seal (8) on keyway in shaft.
5. Mount pump housing (7) to engine using four screws
(5) and washers (6). Apply Loctite 271 or an equivalent
high strength threadlocker and torque to 16 ft.lbs
(22 Nm).
6. Push mechanical seal (2) completely on impeller (1).
7. Install impeller (1). See Section 3.20 Impeller.
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