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 des-
cribed in this section must be followed carefully or
personal injury could result. During removal of the
pump, very powerful springs tend to separate the
pump crankcase from the engine adapter. Failure to
follow the described procedure may result in a
forceful separation of the components.
Differences may exist in pump head components. For
example, the axial cam used on a pump rated 2.0 gallons per
minute must necessarily be different than the axial cam used
on a pump rated at 2.5 gallons per minute.
Special tools needed:
• Dead blow hammer
• 5/16"-18 bottoming tap
• Brass rod, 5mm diameter x 20cm long

Pump Head

Before removing the pump head, disconnect the inlet water
hose from the pump's water inlet. Disconnect the spray gun
high pressure hose from the pump's high pressure outlet
connector. Disconnect the chemical injection siphon tube
from the chemical injection hose barb.
Place a shallow pan underneath the pump crankcase to catch
pump oil. Remove the pump, as described below:
Figure 6.3 - Pump Head
Portable Pressure Washer Familiarization and Troubleshooting Guide
1. Referring to Figure 6.3, replace the two (2) M6-1.0 x 20
cap screws (identified with arrows on the figure) with two
(2) M6-1.0x 45 hex head bolts.
2. Ensure the two bolts described in (1.) above are tight,
then remove the four (4) remaining M6-1.0 x 20 cap
screws.
CAUTION:
pump without installing two longer screws to relieve
the spring tension.
3. As indicated in Figure 6.4, 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 6.4 - Head Screw Removal
4. As the pump crankcase is separated from the engine
adapter, a piston pivot
shoe (shown in Figure 6.5)
may fall out. Ensure that
each shoe is identified with
the same identification
number as the piston it fell
away from. Retain each
shoe with its piston as a
set for later inspection and
installation.
56
Section 6 • Medium Frame Pump
Do Not attempt to disassemble the
Figure 6.5 - Pivot Shoe