Underhill Tracker 2 T-400-2 User manual

T-400-2
Portable Irrigation Machine
Assembly and Operating Instructions
Underhill International Corporation
Irvine, CA USA
866-863-3744 • www.underhill.us

Tracker2 Assembly & Operating Instructions
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Table of Contents
INTRODUCTION .......................................................................................................................................................... 3
APPLICATIONS ............................................................................................................................................................ 3
GENERAL INSTRUCTIONS FOR SAFETY AND ACCIDENT PREVENTION ........................................................................... 3
BEFORE USE ................................................................................................................................................................ 4
RECOMMENDED TOOLS FOR ASSEMBLY ..................................................................................................................... 4
GETTING STARTED ...................................................................................................................................................... 4
WINTERIZATION ......................................................................................................................................................... 7
SPECIFICATIONS ......................................................................................................................................................... 7
PRODUCT DIMENSIONS ........................................................................................................................................................ 7
IMPACT SPRINKLER PERFORMANCE CHART ............................................................................................................................... 8
HOSE FRICTION LOSS CHART ................................................................................................................................................. 8

Tracker2 Assembly & Operating Instructions
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Introduction
Congratulations on your purchase of Underhill’s newest generation of portable irrigation machine
Tracker2. Now more streamlined with the following unique features:
• 328 ft. (100m) of galvanized steel pull cable,
• Simplified gear drive assembly for longer life and consistent performance,
• Nearly fully assembled in the box, simply install the included part-circle impact sprinkler,
• Connect a 1” minimum sized hose,
• Spool out the cable wire and place the included ground stake of where irrigation is to finish,
• Turn on your water supply and step-back.
Please take a few moments and read the following Assembly and Operating Instructions to
familiarize yourself with this product.
Applications
The Underhill Tracker2 is a self-propelled, portable irrigation machine that can be used for a wide
variety of supplemental irrigation when required.
The Tracker2 can pull itself up to 328’ in length from point A to point B. It comes supplied with
galvanized steel pull cable and ground stake. A minimum of 1” supply hose should be about 10%
longer than the length of area to be irrigated depending on the water source.
The Tracker2 comes standard with a part-circle impact sprinkler with a radius of 62 feet (18,9m)
depending on the delivery pressure to the inlet end of the Tracker2. The part circle sprinkler can be
converted to a full-circle model by sliding the trip pin upwards while the sprinkler is set to the
forward mode and not the reverse mode.
Warning: The Tracker2 requires a minimum of 50 Psi water pressure at the inlet end
of the machine.
General Instructions for Safety and Accident Prevention
Develop early and safe habits each time operating the Tracker2 Portable Irrigation Machine, please
check the machine and supply hose. In general:
• Please take a moment and read through these Assembly and Operating instructions prior to
operating this machine.
• Before starting, check the immediate visually check the surroundings for children and/or site
features that might obstruct the Tracker2’s path.
• Working in close proximity to areas to be irrigated is not recommended,
• The sprinkler nozzle while operating should not be pointed directly at anyone.
• Standard safety measures are to be observed when any low overhead or on-grade wires might
exist within the Tracker2’s sphere of irrigation spray. Contact your local electric or power
company to obtain advice about safe operating distances if any potential danger exists.
!

Tracker2 Assembly & Operating Instructions
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Before Use
The following tasks should be reviewed and completed prior to setting the machine into operation:
• Confirm anything that was previously disassembled for transport or maintenance are in their
correct place including the impact sprinkler is tighten into the threaded sprinkler inlet
• Verify the “Stop-Lever Switch” switches off automatically when the machine has spooled up all
pull cable. Adjust as needed
• Regularly check the machine’s maintenance schedule and ensure there is sufficient lubrication.
Recommended Tools for Assembly
The only tool needed for initial assembly is an adjustable wrench with a large enough jaw opening
to secure the impact sprinkler which is included in the shipping carton but not assembled.
Getting Started
The following are set-up instructions of the machine initial and periodic use.
1. Locate the sprinkler inlet at the top of the Tracker2 machine, see Figure 4-1. Wrap the male
end of the impact sprinkler with two full turns of Teflon tape. Initially hand-thread and tighten
the sprinkler into the sprinkler inlet. Use an adjustable wrench to tighten a ¼ more. The
Tracker2 comes standard with a part-circle impact sprinkler with a ¼” diameter nozzle.
In full circle applications, the impact sprinkler will reach a stop and then reverse its direction to
complete the full circle.
Tracker@ Without the Impact Sprinkler
Figure 4-1
2. Locate the Manual Winder Handle (included in the shipping carton) and insert into the crank shaft of
the cable drum, see Figure 4-1 on the preceding page.
!
Install Impact Sprinkler
Insert Winder Handle

Tracker2 Assembly & Operating Instructions
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3. Locate the hose inlet on the backside of the Tracker2, see Figure 5-1. Notice the supplied brass hose
quick-connect. Thread the male end of your 1” hose into the threaded female end of the brass quick
connect. Underhill offers a wide variety of UltraMaxTM 1” hoses in both standard and custom lengths.
See the www.underhill.us “UltraMax Hose Series” for more information.
Depending on your water source, more hose maybe needed depending on the area to be
irrigated.
1” Hose Inlet w/ Brass Quick Connect
Figure 5-1
4. Place the Tracker2 at the end of the area to be irrigated and nearest the water supply. Consider the
radius of the impact sprinkler and delivery pressure to determine the Tracker’s final position particularly
considering prevailing winds.
5. Layout the hose parallel to the travel direction of the Tracker, see Figure 5-2 below. Now make the
hose connection to your water supply. Verify the hose is free of dirt, debris and sand by flushing the
hose from the water supply prior to connecting into the Tracker.
Tracker Hose Layout
Figure 5-2
6. Locate the cable drum nut and trip pin on the side of the Tracker, see Figure 6-1. Pulling outward on
the brass locknut and trip pin. Once released, spool out as much pull cable as needed for the area to be
irrigated. Pull the cable slowly so that it doesn’t unravel too quickly.
Zugseil
bis ca. 100m
ca. 1m
Hydrant
Schlauch
Pflock
!

Tracker2 Assembly & Operating Instructions
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7. Secure the ground stake where irrigation is to finish. To secure the pull cable, by pressing the lock nut
and trip pin inward see Figure 6-1.
Unlocking and Locking Pull Cable
Figure 6-1
8. Locate the Quick Closing Valve on the back end of the Tracker near the hose inlet see Figure 6-2. Push
the level downward and secure in the downward position with the hold.
Quick Closing Valve
Figure 6-2
Attention! The water supply must be OFF while the Quick Closing Valve is opened.
9. Open the water supply. Verify the working or delivery water pressure and water flow is sufficient. The
Tracker2 will start to pull itself along the pull cable by the on-board turbine and gear box.
10. Located at the end of the pull cable is a “Stopper”, see Figure 7-1. This presses the switch-off lever to
close the quick closing valve once all of the pull cable has been spooled and automatically stop further
irrigation.
Pull Lock Nut and Trip
Pin Outward to Unlock
Push Lock Nut and Trip
Pin Inward to Lock
!
The Quick Closing Valve is the
“Open Position” & hooked
The Quick Closing Valve is the
“Closed Position” and unhooked

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Stopper
Figure 7-1
Attention: The hose should not stay under water pressure after the unit has shut down for
an extended period of time. The water supply is to be closed and any remaining water
pressure relieved prior to opening the quick closing valve. Confirm the pull cable has been
release per instruction #6.
Winterization
It is recommended to “winterize” the Tracker2 when stored in freezing climates. Drain any excess water
that might have collected within the machine using compressed air. This can be accomplished by
temporarily removing the impact sprinkler and blowing air back through the hose inlet port.
Then clean and lubricate wheel axles, cable drum, pull cable locking mechanism and winder handle
connection into the main body of the machine.
Specifications
Product Dimensions
Length 32 1-/2” (0,83m)
Width 18” (0,46m)
Overall Height w/ Sprinkler 20” (0,51m)
Overall Height w/o Sprinkler 14” (0,35m)
Maximum Working Pressure 116 Psi (8,0 bar)
Minimum Working Pressure 50 Psi (3,5 bar)
Weight w/o Shipping Carton 81 lbs. (36,7 kg)
Maximum Radius @ 116 Psi 62’ (18,6m)
Travel Speed 33 ft/h (10m/h)
Application Rate 1/8-13/32”/hr. (3-10mm/hr.)
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Tracker2 Assembly & Operating Instructions
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Impact Sprinkler Performance Chart
Nozzle Size
Operating Pressure
at sprinkler
Radius
Flow Rate
Inches / (mm)
Psi
(bar)
Ft.
(m)
GPM
(m3/h)
¼”
(6.4mm)
40
2,8
52’
16,0
9.6
2,2
46
3,2
56’
17,1
10
2,3
53
3,7
56’
17,2
11
2,5
58
4,0
59’
18,0
12
2,8
66
4,6
62’
18,9
12
2,8
69
4,8
62’
18,9
12.7
2,9
Data below recommended operating pressure
Hose Friction Loss Chart
Friction Loss for 1" Hose Lengths in Feet
Nozzle
Size
Inlet Pressure
100'
(approx 60 meters)
260'
(approx 80 meters)
325'
(approx 100 meters)
1/4"
(6,4mm)
51 Psi
6.0 Psi Loss
15.6 Psi Loss
19.5 Psi Loss
65 Psi
6.2 Psi Loss
16.0 Psi Loss
20 Psi Loss
67 Psi
6.5 Psi Loss
16.5 Psi Loss
21 Psi Loss
Notes:
1. The Tracker2 requires a minimum of 50 Psi to the inlet end of the machine (after all losses
calculated through the length of hose to be used)
2. ¼” diameter (6,4mm) nozzle is the standard nozzle used in these calculations
3. The Tracker2 requires a minimum of a 1” hose.
4. To determine if there is sufficient pressure to operate the Tracker, determine the hose
length and associated friction loss from the chart above.
Length of 1" Hose
Water
Source