Cylinder Head

Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump

Cylinder Head

NOTE: Some pump models feature a BRASS cylinder head, some an ALUMINUM cylinder head. To remove the pump cylinder head, refer to Figure 7.12 and proceed as follows: 1. Remove six (6) M8-1.25 socket head cap screws and M8 ribbed lock washers.

Figure 7.12 — Pump Head Removal To remove the three (3) inlet (low pressure) check valves, refer to Figure 7.14 and proceed as follows:

Figure 7.13 — Check Valve Puller

1. Insert the ‘T’ handle through the puller tool thimble (item 1). 2. Turn the puller upper tee handle clockwise until the

Figure 7.14 — Inlet Check Valve Removal

Item Name 1 Spacer plate 2 Head gasket 3 Thermal bypass 4 Plug 5 Cylinder head 6 Lock washer 7 Socket head cap screw 8 Inlet water connector/filter

2. Remove the cylinder head and head gasket. To disassemble the head and remove the check valves, refer to Figures 7.13 to 7.15 and proceed as follows: A special puller tool (included in Generac Portable Products® kit number SRV95523) is used to remove the inlet and outlet check valves. As shown in Figure7.13, the tool consists of a threaded (7/16”-20) tee handle arrangement. Three (3) inlet and three (3) outlet check valves are threaded (7/16”-20) to accept the threaded tee handle. Item Name 1 Puller tool 2 O-ring 3 Check valve 4 Backup ring

puller threads have engaged the check valve threads.

NOTE: Do not turn the tool in too far. An engagement of 2 or 3 threads is sufficient. 3. With the puller threads engaged in the check valve threads, hold the upper ‘T’ handle and keep it from turning while you turn the tool lower ‘T’ handle clockwise. 4. Repeat steps 2 and 3 for the other inlet check valves.