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Engine Adapter O-Rings
Examine the engine adapter o-ring and bolt head o-rings to
ensure they are not damaged. Replace the engine adapter
gasket each time the unit is reassembled. Newer gaskets can
replace older gaskets.
Engine Adapter, Pump Crankcase, Spacer Plate and
Head
Clean all parts. Inspect carefully for cracks, damage, or other
defects. Check for corrosion. Replace any damaged,
defective, or corroded part as necessary.
Axial Cam Drive Components
Referring to Figure 6.16, carefully inspect the engine adapter
bearing and the axial cam bearing assemblies for wear,
damage, freedom of rotation, or evidence of overheating.
Replace any damaged or defective bearing assembly.
Inspect the axial cam assembly and the integral engine shaft
adapter, which mates with an engine shaft keyway. This item
is factory assembled must be replaced as a unit if the keyway
or cam unit is worn or damaged.
Piston & Spring Assemblies
Referring to Figure 6.7 (seen earlier), inspect the three (3)
pistons carefully. Reject all three pistons if any one piston is
scratched, dented, chipped, or otherwise damaged.
WARNING:
Do not strike a piston with any
object or use a piston to strike any object. Do not
drop the piston.
Measure the piston diameter and the piston length (as
shown in Figure 6.17). If the values are not within the
tolerances specified below, replace all three pistons as a set:
Piston diameter: 14.977 mm to 14.985 mm
Piston length: 86.65 mm to 90.05 mm
Inspect the piston pivot shoes, depicted in Figure 6.18. If
damaged, worn, scored, etc., you must replace all three (3)
pistons and shoes as a set.
Section 6 • Medium Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Figure 6.17 — Piston Dimensions
Figure 6.18 — Piston Pivot Shoe
Item
Name
1
Engine adapter
2
Engine adapter bearing assembly
3
Axial cam assembly
4
Axial cam bearing assembly
Figure 6.16 — Axial Cam Drive Assembly
