How To Remove a Pump from the Gas Engine and Gearbox

Posted by Sprayer Depot on

Sprayer Repair DIY

Repairing a Pump that's Attached to an Engine and Gearbox

We’ve received a good amount of questions about how to remove a pump from the gas engine and gearbox on various sprayers. With so many pieces and sprayer parts, it’s easy to get hung up, especially if you forget to remove a bolt.HyproD30_copyLet's walk through the process using the popular Hypro D30 pump as an example.

Before we get started, here are the tools you’ll need to have on hand to make this run smoothly:

  • Wrench
  • Allen key(s)
  • Flat chisel
  • Hammer
  • Pry bar

1. Drain the Oil

First, undo the bottom drain plug at the bottom of the gearbox and drain the oil into a pan. Clean up any mess. You’re now ready to disassemble.

2. Disassemble

Remove the five bolts that connect the two halves of the gearbox. There are four large bolts that face the pump and one medium sized bolt at the bottom that faces the engine. Remove these five bolts and separate the two components. 

Tip: If you have trouble, this is where the flat chisel and hammer come into play. To get the separation started between the two components, lightly hammer the chisel into the crevice that joins the two components and you’ll have them apart in no time.

Set the engine to the side for a moment as we focus on the gearbox and pump that are still connected. Inside the gearbox you’ll see a gear and three bolts. Remove the three bolts. Then separate the gearbox from the pump. This will allow you to have better access to the pump and/or replace the pump altogether if necessary.

Tip: Use your flat chisel to hold the gear in place while you loosen the bolts.

To separate the other part of the gearbox from the engine, you’ll need to remove the four small bolts that connect the two components. Then you may have to enlist a variety of tactics to separate the two. You could turn the gearbox and using a rubber mallet gently tap the gearbox to loosen it. Another option is to use a pry bar or two to nudge the gearbox off the engine. Worst-case scenario is that you destroy the gearbox in the process and will need to replace the gearbox altogether.

Tip: Cut down a standard Allen key that fits this size of bolt. A shorter Allen key will provide easier access to take the top bolts out.

3. Finish the Repairs

From here you will have access to make the repairs needed. If you get stuck along the way, give our customer service technicians a call at 800-228-0905.


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