Automatic Lubrication System Design Guide - Graco 309015B Design Manual

Automatic Lubrication System Design Guide

System Design
Outlined below is a simple five step method for designing a single line parallel automatic lubrication system for a
haul truck.
Step 1: Identify points for lubrication
Step 2: Determine grease volume requirement for each bearing size
Step 3: Determine number of injectors per point, injector setting and timer setting
Step 4: Determine supply line and feed line plumbing requirements
Step 5: Determine bill of material
Step 1: Identify points for lubrication.
First, make a rough sketch of the equipment being lubricated. Number the points to be lubricated and put these
points into groups. The groups will be made up of a number of lubrication points where feed lines can be connected
from a central location.
Hint: Group points with common locations together. Most haul truck systems have three groups of injectors. One
at the rear of the truck for the shock absorber joints and box joints, and one on each side of the truck located near
the front wheels. These groups typically lubricate the steering joints and front struts of the truck.
Enter the points on the System Worksheet (page 15) with the number and brief description.
Indicate whether the bearing is a flat, journal, or roller bearing.
Step 2: Determine grease volume requirement for each bearing size
Enter the bearing dimensions on the System Worksheet. Use the appropriate Volume Chart (page 16) to determine
the bearing lubricant volume for each point based on the bearing dimension. Record the volume on the System
Worksheet.
NOTE: The Volume Charts use an assumption of a 0.002" film thickness of lubricant to calculate the bearing lubri-
cant volume.
Step 3: Determine number of injectors per point, injector setting and timer setting
Using the Injector and Timer Setting Chart on page 17, place a check mark in the corresponding bearing volume for
each lube point from the calculations in the System Worksheet. Round up to the next higher volume.
After you have recorded all of the points of lubrication on the Injector and Timer Setting Chart, you will be able to
select a time setting. From the chart, notice that as you extend the timer pause interval you may need more than
one injector for a single point of lubrication. Therefore, select a time setting where all the points can be serviced
with the minimum number of injectors.
NOTE: If you have a few points that are far to the right on the chart, you can use more than one injector to lubricate
each of those points. If you have a point that does not make the chart on the left side, you can set the injector to
the minimum setting and slightly over-lubricate that point. Or, you may decide the point is so small that you do not
include it in the system.
Once you have selected a time setting, record it on the System Worksheet. Based on the selected time setting, de-
termine the number of injectors per point of lubrication and the injector setting. Record this information on the Sys-
tem Worksheet.
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