STIHL MS 170 Not Oiling Bar
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
91%
CONF
|
Worm Gear (Drive Gear)
This nylon gear connects the clutch drum to the oil pump piston. In the MS 170, the gear's drive arm or internal threads frequently strip or melt due to heat soak from the clutch, severing the mechanical link required to drive the pump. This is the statistically most likely cause of a complete oiling failure on this specific chassis.
SKU: 1123 640 7102
|
|
|
5%
CONF
|
Oil Pump Assembly
The MS 170 uses a fixed-flow pump that can become internally seized or bypass internally if the piston-to-bore tolerance is compromised. If the worm gear is intact but no oil is being displaced into the delivery channel, the internal check valves or the piston within this assembly have likely failed.
SKU: 1130 647 9400
|
|
|
4%
CONF
|
Oil Pickup Hose
The rubber pickup hose maintains a vacuum seal between the oil reservoir and the pump inlet. Over time, exposure to various oil viscosities can cause the rubber to shrink or crack at the pump interface, allowing air to enter the system (cavitation) and preventing the pump from drawing oil from the tank.
SKU: 1130 358 7701
|
DIY Repair Guide
Watch exactly how to replace the Worm Gear (Drive Gear).
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.