Part number 704-173A is a crankshaft and gear assembly used to convert rotary motion into the reciprocating action that drives the piston in compatible sprayers. This assembly is a critical component for maintaining consistent pressure and flow. It is compatible with RentSpray 600, RentSpray 600 Impact, RentSpray 500, Impact X 540i, Impact X 440, Impact X 410, Impact 640, Impact 640 I and IA, Impact 440 service, and 740 ix Airless Sprayer models. Replacing a worn or damaged crankshaft restores pump performance and helps prevent further internal damage.
| Part Number | 704-173A |
|---|---|
| Part Description | Crankshaft/Gear Assembly |
| Compatible Models | RentSpray 600; RentSpray 600 Impact; RentSpray 500; Impact X 540i; Impact X 440; Impact X 410; Impact 640; Impact 640 I and IA; Impact 440 service; 740 ix Airless Sprayer |
| Condition | New |
The 704-173A crankshaft and gear assembly is a precision component that transforms the rotational force from the motor into the linear motion needed to drive the pump piston. This action creates the high pressure required for airless spraying. It is designed for use in a wide range of sprayers, including RentSpray 600, RentSpray 600 Impact, RentSpray 500, Impact X 540i, Impact X 440, Impact X 410, Impact 640, Impact 640 I and IA, Impact 440 service, and 740 ix Airless Sprayer models. Over time, the crankshaft bearings and gear teeth can wear due to continuous operation, lack of lubrication, or contamination. Symptoms of a failing assembly include knocking noises from the pump area, erratic pressure, reduced flow, or complete pump seizure. Replacing the assembly restores smooth mechanical operation and ensures the sprayer can maintain proper pressure for consistent coating application. The gear profile and crankshaft journals are manufactured to match original specifications, ensuring correct timing and alignment with the connecting rod. When installing, it is recommended to inspect related components such as bearings, seals, and the connecting rod for wear. This assembly is balanced to reduce vibration, which helps extend the life of the pump and motor. Using a genuine replacement part maintains the integrity of the drive system and prevents premature failure of other internal parts. Proper installation following the service manual is essential for optimal performance and safety.
| Motion conversion | Changes rotary motor motion into reciprocating piston movement |
|---|---|
| Torque transmission | Transfers motor power to the pump via the gear and crankshaft |
| Timing and alignment | Maintains correct relationship between piston stroke and rotation |
| Knocking or grinding noise | Indicates worn bearings or gear teeth |
|---|---|
| Erratic or surging pressure | Crankshaft play causes inconsistent piston stroke |
| Pump binds or seizes | Damaged crankshaft prevents smooth rotation |
| Visible wear or scoring | Inspect if disassembled for related repairs |
Part number 704-173A is compatible with the following sprayer models. Always verify using your equipment's serial number and parts manual.
| Brand / Series | Specific Models |
|---|---|
| RentSpray | 600, 600 Impact, 500 |
| Impact X | 540i, 440, 410 |
| Impact | 640, 640 I, 640 IA, 440 service |
| 740 ix | Airless Sprayer |
When replacing the crankshaft assembly, inspecting these associated components can help ensure a complete repair.
Support the crankshaft; worn bearings cause misalignment and noise. Replace if rough.
Attaches crankshaft to piston; check for wear or bending at the small end.
Prevent oil leakage and contamination; always replace when opening the gear case.
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