Part number 805-240 is a 1st stage gear assembly designed to provide initial speed reduction and torque multiplication from the motor to the drive system on compatible Impact sprayers. This precision‑engineered assembly includes the input gear, shaft, and bearings that form the first reduction stage in the gearbox. Replacing a worn, damaged, or noisy 1st stage gear assembly restores proper power transmission, reduces operating noise, and prevents further damage to downstream drive components.
| Part Number | 805-240 |
|---|---|
| Part Description | 1st Stage Gear Assembly |
| Brand | Impact |
| Fits | Impact 740, 840, 840 I and IA, 740‑840 |
| Condition | New |
The 805-240 1st Stage Gear Assembly is the primary reduction component in the gearbox of compatible Impact sprayers. It receives power directly from the motor and provides the first stage of speed reduction while increasing torque before transmitting power to subsequent gear stages and ultimately to the pump drive.
Over time, gears can wear due to high loads, inadequate lubrication, or contamination. Symptoms include whining or grinding noises, increased vibration, reduced pump speed, or complete loss of drive. A worn 1st stage gear can also generate metal particles that damage downstream bearings and gears. Replacing the assembly restores proper gear mesh, reduces noise, and ensures reliable power transmission.
| Speed reduction | Reduces motor RPM to optimal speed for pump operation |
|---|---|
| Torque multiplication | Increases torque to drive the pump under high pressure |
| Power transmission | Transfers motor power to subsequent gear stages |
| Noisy operation | Whining, grinding, or chattering from gearbox |
|---|---|
| Vibration | Excessive vibration during operation |
| Worn teeth | Visible wear, pitting, or chipping on gear teeth |
| Metal particles | Debris in gearbox oil indicating gear wear |
Part number 805-240 is compatible with the following Impact models. Always confirm fitment using the correct parts diagram for your exact model and serial number.
| Model | Component |
|---|---|
| Impact 740 | 1st Stage Gear Assembly |
| Impact 840 | 1st Stage Gear Assembly |
| Impact 840 I and IA | 1st Stage Gear Assembly |
| Impact 740‑840 | 1st Stage Gear Assembly |
Gear assembly issues may involve associated components. When servicing the 1st stage gear assembly on your Impact sprayer, these parts are commonly inspected or replaced at the same time.
Inspect subsequent gears for wear caused by debris from failing 1st stage.
Check support bearings for wear or damage; replace as needed.
Replace oil and seals to ensure proper lubrication and prevent leaks.
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