Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump
Cylinder Head
To remove the three (3) inlet (low pressure) check valves, refer to Figure 7.14 and proceed as follows:
NOTE: Some pump models feature a BRASS cylinder head, some an ALUMINUM cylinder head.
Figure 7.13 — Check Valve Puller
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
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
Item
Name
1
Puller tool
2
O-ring
3
Check valve
4
Backup ring
puller threads have engaged the check valve threads.
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:
NOTE: Do not turn the tool in too far. An engagement of 2 or 3 threads is sufficient.
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 Figure 7.13, the tool consists of a threaded (7/16”-20) tee handle arrangement.
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.
Three (3) inlet and three (3) outlet check valves are threaded (7/16”-20) to accept the threaded tee handle. 84
