Gearbox Assembly Guide

Here's a step-by-step guide for assembling a pressure washer with a gearbox:

Step 1: Check Key-way Alignment Ensure that the key-way on the motor shaft and gearbox shaft are aligned properly. Make sure everything is facing upward for easier installation.

Step 2: Lubricate the Gearbox Interior Shaft Apply a small amount of high-temperature lube or anti-seize to the interior shaft of the gearbox. Remember, a little goes a long way. Inspect to ensure proper lubrication—neither too much nor too little.

Step 3: Key Way Alignment (VERY IMPORTANT) Install the shaft key about 1/8th" away from the end of the motor shaft. This alignment is crucial for proper operation.

Step 4: Install the Gearbox on the Engine Shaft Hold the key in place with a finger and carefully slide the gear box assembly onto the engine shaft. Pay close attention to ensure the key stays in place and remains properly aligned. The gear box should slide on with little to no resistance. If it gets caught or stops, the key may have shifted. Remove and try again. Ensure the gear box touches flush with the face of the power unit, and all movements are smooth and easy on the engine shaft.

Step 5: Install Compression Washers to 9/16th Hex Bolts Properly install compression washers onto the four 9/16th Hex Bolts. The crown of the washer should face the bolt head (convex up). No thread lock is needed for installation onto the motor.

Step 6: Install Hex Bolts and Brass Washers Between Gear Box Hand tighten all four hex bolts after slightly backing off the gear box from the shaft. Install spacers, washers, and bolts. If you're using a pump support bracket, install it during this step.

Gap Is Normal When tightened, there will be a small gap between the gearbox and the power unit. This is normal and indicates proper installation with even and smooth contact.

Step 7: Torque Hex Bolts Using a torque wrench, tighten the hex bolts to 40nm (221in.lbs). Do not use thread lock for this step, as over-tightening can result in bolt snapping or damage to the gearbox.

By following these steps, you can assemble a pressure washer with a gearbox. Ensure proper alignment, lubrication, and torque specifications to ensure the longevity and efficient operation of your pressure washer.