Service Information
Rev. 04/2004 • 907634
Webasto Product North America, Inc.
•
North American Headquarters
• 15083 North Road • Fenton, Michigan 48430
For Technical Assistance Call:
(800) 555-4518 •
In Canada Call:
(800) 667-8900
Visit us on the Web at:
www.webasto.us (North America) www.webasto.com (Global)
Seal Kit Assembly Instructions for Coolant Pumps:
U4814, U4816, U4817 and U4851
*
04-15-2004
Revised Seal Kits (P/N 50906084A & P/N 5000153A) for Circulation Pumps with Axial Face Seals.
Seal Replacement Kit Contents:
1 Pump impeller
1 Pump housing base with integrated seal.
1
*
Pump cover
1 Sliding seal ring with date of manufacturing (in protective
container)
1 Nut
1 O-ring seal
4
*
Screws
4
*
Spring washers
1 Washer
1 Splash guard
1 Bottle of lubricating oil
1 Replacement part label
1 Service Information Bulletin (P/N 907634)
*
not included in seal kit P/N 50906084A
General Information
A new sliding seal ring is included in the replacement kit
50906084A for maintenance work on circulation pumps U4814,
U4816, U4817 and U4851
*
. Care should be taken
when
installing the sliding seal ring. When replacing parts,
the entire
seal set must be replaced, not just the sliding unit.
ATTENTION!
Before using a replacement part, check date of manufacture
on the sliding seal protective container. Maximum shelf life is
4 years after date of manufacture.
Disassembly (See Figure 2)
1. Remove screws (item 1).
2. Remove pump cover (item 2), check for damage and
discard if necessary (replacement part P/N 5097664A).
3. While pressing against pump impeller (item 4) remove nut
(item 3) from motor shaft and discard.
4. Pull off pump impeller (item 4), washer (item 5) from
motor shaft and discard.
5. Remove screws (item 8) together with spring washers
(item 9) from pump base (item 10) and discard.
6. Pull off pump base (item 10) with axial seal (item 6), base
axial seal (item 13) and the O-ring seal (item 7) from motor
shaft and discard.
7. Pull off washer (item 11) and splash guard (item 12) from
the motor shaft and discard.
8. Check motor for smooth running. If damaged or an
unbalanced state or noise is noticed, replace motor.
Replacement
Part Label
Figure 1
Figure 2: Disassembly
Motor Shaft
Legend for Figure 2
1 Screw (4)
2 Pump cover
3 Nut
4 Pump impeller
5 Washer
6 Axial face seal
7 O-ring seal
8 Screw (4)
9 Spring washer (4)
10 Pump base
11 Washer
12 Splash guard
13 Base axial seal
NOTE: U 4851 Pump has been superseded to U 4855 Pump.