Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump
4. As the pump crankcase is separated from the engine adapter, three (3) piston pivot shoes (shown in Figure 7.5) will fall out. Retain the shoes for later inspection and installation.
3. Remove the engine adapter bearing assembly.
Figure 7.5 - Pivot Shoe
4. Remove the M16-1.50 Jam Nut and the Belleville washer. 5. Remove the axial cam. 6. Referring to Figure 7.7, use a special engine shaft adapter puller tool to remove the engine shaft adapter: Figure 7.7 - Puller Tool on Tapered Shaft
Axial Cam Drive Components - (Tapered Engine Shaft) On units with tapered engine shafts, the engine shaft adapter is retained to the engine shaft by means of an M16-1.50 Jam Nut and a Belleville washer. To remove the axial cam drive components from the engine shaft, proceed as follows, referring to Figure 7.6: Figure 7.6 - Axial Cam Drive Components (Units with Tapered Engine Shaft)
a. Attach the tool to the threaded portion of the engine shaft adapter. b. Turn the bolt on the tool firmly against the engine tapered shaft, putting tension on the engine adapter. Then strike the bolt head with a dead blow mallet.
Item
Name
1
O-ring
2
Engine Adapter
3
Roller Thrust Bearing
4
Engine Shaft Adapter
5
Axial Cam
6
Bearing Assembly
7
Belleville washer
8
Jam nut
c. Continue tightening the tool bolt against the engine shaft and striking with the mallet until the engine shaft adapter is completely free of the engine shaft. Remove the engine shaft adapter. 7. Remove four (4) 5/16”-24 socket head or button head cap screws that retain the engine adapter to the engine. Remove the engine adapter. The large o-ring seal or gasket found between the engine adapter flange and pump crankcase flange can also be removed. 8. If necessary, remove the engine adapter sleeve from an older-model engine adapter. New models have an integral engine adapter pilot.
1. Remove the pump head, as described previously. 2. Remove the axial cam bearing assembly. Some models will have a ball bearing, some a roller bearing. KEEP BEARING RACES AND BEARINGS TOGETHER AS A SET. 81
