Underhill Tracker Operation and maintenance manual

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T-400
Portable Irrigation Machine
Underhill International Corporation
25782 Obrero Drive Unit C
Mission Viejo, CA 92691
Phone: [phone] Fax: [phone]
www.underhill.us
Assembly Instructions and Operation Manual

Underhill Tracker Assembly and Operation Instructions
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Table of Contents
Table&of&Contents&...................................................................................................................................&2!
Tracker&Views&.........................................................................................................................................&3!
Introduction&............................................................................................................................................&4!
Application&..............................................................................................................................................&4!
Getting&Started&.......................................................................................................................................&5!
Recommended&Tools&for&Assembly&.................................................................................................&5!
Assembly&Instructions&.........................................................................................................................&6!
Assemble'and'Install'the'Wheels'.........................................................................................................................'6!
Assemble'and'Install'The'Water'Supply'Fittings'.........................................................................................'7!
Install'the'Impact'Sprinkler'..................................................................................................................................'8!
Converting'a'Part'Circle'to'a'Full'Circle'Arc'Pattern'.................................................................................'8!
Tracker'Operation'.....................................................................................................................................................'9!
Locate'the'Pull'Rope'Release'Mechanism'.....................................................................................................'11!
Locate'the'Auto'Shut-off'.......................................................................................................................................'11!
Operation&...............................................................................................................................................&13!
Required'Operating'Pressure'.............................................................................................................................'13!
Speed'Adjustment'....................................................................................................................................................'13!
Set-up'to'Water'........................................................................................................................................................'13!
Maintenance&..........................................................................................................................................&14!
Troubleshooting&..................................................................................................................................&14!
Spare&or&Replacement&Parts&............................................................................................................&14!
Tracker&Operation&Video&..................................................................................................................&14!
Underhill&UltraMaxTM&Hose&Series&.................................................................................................&14!
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Underhill Tracker Assembly and Operation Instructions
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Tracker Views
Speed Control
Nylon Pull-
Rope
Auto Shut-Off
Pull-Rope
Release Mechanism
Pull-Rope Drum
Hub Cap
Valve
1” Brass
Quick-Disconnects
1” Supply
Hose
Tracker
End View
Tracker
Top View
Impact Sprinkler
w/ #07 nozzle

Underhill Tracker Assembly and Operation Instructions
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Introduction
Congratulations on your purchase of Underhill’s Tracker, portable irrigation machine. Please
take a few moments to read the following Assembly and Operating Instructions to become
familiar with this product.
Using your smart phone, scan the following symbol for a quick overview video on
the Tracker operation.
Application
The Tracker is a self-propelled, portable irrigation machine that can be used for irrigating sports
field, pastures, or large parks when supplemental irrigation is required.
Tracker Portable Irrigation Machine
Figure 4-1
The Tracker pulls itself up to 360’ in length with the supplied nylon pull-rope to a ground stake
and will automatically shut itself off when it’s reach the end of its tether. A 1” supply hose
should be 10% longer than the length of area to be watered.
The Tracker has a full-circle sprinkler pattern of 70-80 feet in diameter (depending on delivery
pressure and standard nozzle).
Warning: The Tracker requires at least 9 GPM and a 1” diameter hose plus a
minimum of 50 Psi at the inlet side of the unit.
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Underhill Tracker Assembly and Operation Instructions
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Getting Started
The table below identifies the contents of the shipping carton, also shown in Figure 5-1.
Inspect each component to make sure none were damaged in transit. If you determine parts
are missing or are damaged, contact Underhill International Corp. at [phone].
No
Qty
Description
1
4
Plastic wheels
2
4
Aluminum wheel axles
3
4
Gray plastic wheel hubcaps
4
8
Black plastic axle retainer clips
5
1
Galvanized ground stake
6
4
Tracker chassis w/ hinged red plastic cover
7
1
Adjustable full/part circle impact sprinkler w/ #07 nozzle
8
1
Male to female brass quick-connect hose fitting
9
1
Operating and Maintenance Manual
Contents of Tracker Shipping Carton
Figure 5-1
Recommended Tools for Assembly
The following is a list of tools or other components needed to quickly assemble the Tracker.
No.
Tool Description
1
Large crescent wrench
2
½” Teflon Tape
With the proper tools, assembly should take approximately 15-20 minutes.

Underhill Tracker Assembly and Operation Instructions
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Assembly Instructions
The sequence of installing the Tracker is listed below;
• Assemble and install the wheels
• Assemble and install the water supply fittings
• Install the impact sprinkler
• Locate and understand pull-rope release mechanism
• Locate and understand how the auto-shut-off function operates.
Assemble and Install the Wheels
Place the Tracker on its side. Insert the one of the hollow aluminum axles into the one of
the wheels with the ribs of the wheel facing outward as shown in Figure 6-1.
Inserting Axle into Wheel
Figure 6-1
Slide the wheel and axle assembly into the axle support and clip into place with the
black axle retainer clip so the smooth side of the wheel faces inward. See Figure 6-2.
Snap Retainer Clip onto Axle
Figure 6-2
Repeat this process for the remaining 3 wheels

Underhill Tracker Assembly and Operation Instructions
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Once the wheels are installed, attach the 4 (gray) hubcaps as shown in Figure 7-1.
Installing Hubcaps
Figure 7-1
Assemble and Install The Water Supply Fittings
Locate the 1” brass threaded inlet on the back of the Tracker. Wrap the male threads of
the 1” brass, male to female quick-connect with Teflon tape and thread into this inlet,
see Figure 7-2. Hand-tighten, then ¼ turn further with a crescent wrench to prevent
leakage.
Thread Brass Quick Connect into Tracker Inlet
Figure 7-2
The mating connector to this quick connect has a 1” female hose thread (FHT) to attach
to a 1” diameter hose, See figure 7-3.
1” Female Hose Thread
Figure 7-3

Underhill Tracker Assembly and Operation Instructions
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Install the Impact Sprinkler
Wrap the male threads of the impact sprinkler with 3 or 4 turns of Teflon tape and
thread into the 1” outlet on top of the Tracker, see Figure 8-1. Tighten ¼ turn further
with a crescent wrench.
Note: Confirm the red cover is closed before connecting the sprinkler.
Installing the Impact Sprinkler
Figure 8-1
Converting a Part Circle to a Full Circle Arc Pattern
Unthread!and!remove!the!Tracker!sprinkler.!!Turning!the!sprinkler!upside!
down,!locate!the!arc!pattern!“trip-lever”!on!the!opposing!side!of!the!main!
nozzle!as!shown!in!Figure!8-2.!!There!are!two!rectangular!openings,!one!
larger!than!the!other!(shown!in!dashed!yellow!lines).!!Pinch!the!outward!
facing!wires!together!while!rotating!the!one!side!with!the!larger!slot!molded!
in!the!underside!of!the!mechanism!upward!at!the!same!time!to!remove!the!
trip!lever.!!Now!the!sprinkler!will!rotate!continuously!in!a!full!circle.!!!
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Removing the Arc “Trip-Lever”
Figure 8-2
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Underhill Tracker Assembly and Operation Instructions
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Tracker Operation
When connected to a 1” diameter hose (to support the flow demand of the impact
sprinkler), with a minimum of 50 Psi, the Tracker will automatically pull itself along the
nylon cord, then automatically shut off once it’s reach the ground stake.
Unthread the impact sprinkler and open the plastic cover of the Tracker. Figure 9-1
shows mechanical “On/Off” features of the Tracker.
Tracker “On”
Figure 9-1
When the cut-off rod is turned downward as shown in Figure 9-2, the spring-loaded rod
will be pushed away from the valve. A rubber ball will be pressed to the seal ring to
close the water flow to space outside of the diaphragm shown above, thereby allowing
water to flow past the turbine and out through the sprinkler.
Tracker Operating
Figure 9-2

Underhill Tracker Assembly and Operation Instructions
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When the pull rope mechanism is pushed inward (see Figure 10-1), simulating the all of
the nylon pull rope has been spooled, the spring loaded cut-off rod slides into the notch
as shown in orange below.
Cut-Off Rod Push Inward
Figure 10-1
When cut-off rod is in this position, a rubber ball will be pushed away from the seal ring.
This enables water to by-pass the seal ring and pressurizes the space outside of the
diaphragm shown in blue in Figure 10-2 below automatically shutting off the Tracker.
Tracker “Off”
Figure 10-2
Note: If the Tracker is observed to no longer pull it self along the nylon rope,
then the cone-shaped inlet of the diaphragm is clogged w/ debris and needs to
be cleaned.
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