Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump
NOTE: When installing the engine adapter having the o-ring seals, be sure to use the correct button head cap screws. DO NOT use any other type fastener.
Piston Oil Seals and Pistons Refer to Figure 7.33 for this procedure. Figure 7.33 — Oil Seals & Pilot Spacers
3. Install the engine shaft adapter over the engine shaft, as shown in Figure 7.31 or 7.32. 4. Install the engine adapter bearing race, followed by the engine adapter bearing and the inner cam bearing race. Refer to Figure 7.30. a. For ROLLER BEARINGS, the chamfered edge of the bearing races must face AWAY FROM THE BEARING ROLLERS. That is, the flat (unchamfered) side of the race must ride against the rollers. b. For BALL BEARINGS, the bearing races are grooved to accept the bearing balls. MAKE SURE THE BEARING BALLS ARE RIDING IN THE BEARING RACE GROOVES. 5. Install the axial cam assembly. The factory-installed adapter has a built-in key which must engage with a keyway on the straight (non-tapered) engine shaft. Push the cam toward the engine until it seats against the engine adapter bearing race. 6. Again referring to Figure 7.30, install the outer cam bearing race, axial cam bearing and piston shoe bearing race. a. For ROLLER BEARINGS, the chamfered edge of the bearing races must face AWAY FROM THE BEARING ROLLERS. That is, the flat (unchamfered) side of the race must ride against the rollers.
Item
Name
1
Pilot spacer tang engaged in crankcase locating notch
2
Crankcase locating notch
3
Pump crankcase
4
High pressure oil seal
5
Pilot spacer
1. Pre-lubricate three (3) piston oil seals with 80W90 oil. 2. Press a seal into one of the piston bores provided on the pump crankcase, with the writing on the face of seal toward the installer. Press the seal in it bottoms. Repeat this step for the two (2) remaining seals.
The inside diameter of the outer cam bearing race is larger than the piston shoe bearing race. b. For BALL BEARINGS, the bearing races are grooved to accept the bearing balls. MAKE SURE THE BEARING BALLS ARE RIDING IN THE BEARING RACE GROOVES.
3. Install the three (3) pilot spacers over the piston oil seals, as shown in Figure 7.33: a. Larger diameter flange of the pilot spacers must face downward (away from installer). b. Two small locating tangs on the pilot spacers must fit inside locating notch of the pump crankcase, as depicted in Figure 7.33.
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