Douglas Dynamics Western Plows 85695, Owner'S Manual

Page: 15 / 28

Lit. No. 74226, Rev. 00 15 September 15, 2020
OPERATING INSTRUCTIONS
ADJUSTING THE FLOW
To adjust the fl ow between direct application on the
chute and direct application to the material, rotate the
valve on the front of the pump box.
The following table shows the fl ow rates for the
ON/OFF system. These values are approximate
and can vary based on system con
fi guration, age of
components, brine composition, and other factors.
The fl ow of the system is controlled by a needle valve
inside the pump box. Follow the instructions below to
adjust the
fl ow.
1. Remove the pump box cover.
2. Turn the white plastic handle to the left of the
pump. Clockwise will reduce the fl ow and
counter-clockwise will increase the fl ow.
NOTE: Do not overtighten the handle.
Overtightening may damage the valve
.
3. With the pump running, turn the valve clockwise
until the fl ow stops. This is the "zero fl ow" point.
Do not turn the valve further.
4. Mark the valve handle and body to indicate the
"zero fl ow" point for future reference.
5. Turn the valve counter-clockwise a number of
complete turns as indicated by the "ON/OFF Flow
Rates" table below.
ON/OFF Flow Rates
Number of Turns from
Zero Flow Position gal/min
0 0
1/4 0.22
1/2 0.46
3/4 0.66
1 0.80
2 1.13
3 1.40
3-1/2+ 1.60
No Valve 2.00
NOTE: If higher fl ow rates are required, bypass
the needle valve to increase the fl ow. Refer to
Bypassing the Needle Valve.
BYPASSING THE NEEDLE VALVE
1. Remove the needle valve and install the 1/2" hose
barb directly into the street elbow.
2. Replace the hose with the 1/2" hose kit. The new
fl ow rate will be approximately 2.63 gal/min.
MANUALLY CALIBRATING THE FLOW
To obtain a more precise measurement of the fl ow
rate, follow the steps below.
1. Adjust the liquid system to the desired setting.
2. Disconnect the 1/2" hose connected to the spray
hose and place it in a 5-gallon bucket.
3. Turn on the liquid system and time how long
it takes (in seconds) for the system to fi ll the
5-gallon bucket.
4. Determine the fl ow in gal/min by dividing 300 by
the results from Step 3 (in seconds).
Example:
It took 165 seconds to fi ll the bucket.
300
= 1.82 gal/min
165