Part 2 - Disassembly; General Information & Special Tools; Pump Head - Briggs & Stratton CE8070 Troubleshooting Manual

Part 2 - Disassembly

General Information & Special Tools
DANGER:
The pump removal procedures
described in this section must be followed carefully
or personal injury could result.
During removal of the pump, extremely powerful
springs tend to separate the pump head from the
engine adapter. Failure to follow the described
procedure may result in a forceful separation of the
head from the adapter.
Because different pressure washer models may use different
engines, some differences may exist between pressure
washer pumps. Such differences will be found primarily in
the engine adapter section of the pump. For example, some
engines feature a tapered crankshaft while others may be
equipped with a straight shaft. And, of course, the engine
adapter itself must be designed for attachment to a specific
engine.
In addition, some pumps may be equipped with ball cam
bearings while others have roller cam bearings. Differences
may also exist in pump head components. The axial cam
used on a pump rated 2.5 gallons per minute, for example,
must necessarily be different than the axial cam used on a
pump rated at 3 gallons per minute.
Special tools needed:
• Special engine shaft adapter puller tool,
Portable Products®
• Dead blow mallet
• 0.25" dia. 7" long brass rod

Pump Head

Before removing the pump head, disconnect the inlet water
hose from the pump's water inlet. Also disconnect the spray
gun high pressure hose from the pump's water outlet
connector. With the hoses disconnected, remove the pump:
1. Referring to Figure 7.3, replace the two (2) M6-1.0 cap
screws with two (2) M6-1.0 x 45mm hex head bolts.
2. Ensure the two bolts described in (1.) above are tight,
then remove the four (4) remaining M6-1.0 cap screws.
CAUTION:
Do Not attempt to disassemble the
pump without installing two longer screws, as
described, to relieve the spring tension.
Generac
part number SRV95523
Portable Pressure Washer Familiarization and Troubleshooting Guide
Figure 7.3 - Pump Head
3. As depicted in Figure 7.4, start backing out the two bolts
installed in (1.). Alternate between the two bolts, using
them as a "jacking" device to separate the pump
crankcase from the engine adapter while relieving spring
tension from between these two components.
Figure 7.4 - Head Screw Removal
80
Section 7 • Large Frame Pump