Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump
On units so equipped, inspect the three (3) lock rings and the three (3) spring retainers; replace if damaged. Inspect the three (3) piston springs. Ends must be closed and ground square. Check spring free length and load length as follows, referring to Figure 7.27: Figure 7.27 — Piston Return Spring
Item
Name
1
Free length
2
Load length
1. Free length should be 62.57 mm (2.463”). 2. Apply a force of 51.0 to 56.4 pounds (227.2 to 251.1 Newtons). At the stated load, spring length should be 39.8 mm (1.567”). Replace any spring that is damaged or broken. replace spring if free length or load length is not as stated. Unloader-Pressure Regulator Valve Refer to Figure 7.11, seen earlier. Replace any damaged or defective parts as necessary.
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