Hunter P490 User manual

P490/P491HD Pit Rack Operation
Manual
Form RM07895-00, 01-2021

Table of Contents
1. For Your Safety ............................................................................................................................................. 3
1.1. Decal List .......................................................................................................................................... 3
1.2. Decal Overview .................................................................................................................................. 3
2. Operations .................................................................................................................................................... 4
2.1. Chocking Procedure ........................................................................................................................... 4
2.2. Unlock and Lock Slip Plates with PowerSlide Slip Plates (Optional) ....................................................... 4
3. Jack Operations (Optional) ............................................................................................................................ 4
3.1. Preparing the Vehicle for Lifting ........................................................................................................... 4
3.2. Jacking Procedure ............................................................................................................................. 5
3.3. Lowering the Jack .............................................................................................................................. 6
4. Position Runway ........................................................................................................................................... 6
5. Regular Maintenance .................................................................................................................................... 7
5.1. Jack Schedule ................................................................................................................................... 7
5.2. Warranty Information .......................................................................................................................... 8
P490/P491HD Pit Rack Operation Manual
Page 2 of 8

1. For Your Safety
CALIFORNIA WARNING
This product may contain chemicals known to
the State of California to cause cancer and re-
producve harm. www.P65Warnings.ca.gov
Please read and follow these decal instrucons to prevent
equipment damage and/or personal injury. If any decal
shown in this manual has been removed, is missing, or can-
not be read completely for any reason, contact your local
service representave for a replacement decal(s). Or call
Hunter Engineering Company at 1-800-448-6848. A new
warning label kit, 20-3064-1 may be ordered free of charge.
The kit will contain all the decals described in the lists be-
low.
1.1. Decal List
• 128-1089-3DECAL-COMPOSITE RACK #3
• 128-1091-3DECAL-COMPOSITE RACK #5
• 128-1752-2DECAL-HUNTER WHITE, 19"
• 128-1835-2DECAL-MAX VEHICLE WT 35,000#
• 128-202-2DECALS HANDS OFF
• 128-245-2DECAL-YELLOW and BLACK
1.2. Decal Overview
128-180-2
128-567-2
128-571-2 One per turnplate / slip plate
128-1835-2 One scker per runway
128-202-2 Hands Cauon: PowerSlide Runways
P490/P491HD Pit Rack Operation Manual
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2. Operations
NOTE
Read and thoroughly familiarize yourself with
these instrucons before operang.
Be certain the front wheel stops are in the "up" posion.
Carefully drive the vehicle onto the runways unl the front
wheels are centered on the plates. Apply the parking brake.
Chock the front and rear of the le front wheel and le rear
wheel so the vehicle can move no more than 1" forward or
rearward.
Chock the wheels.
Be sure the vehicle parking brake is applied and transmis-
sion is in park. Remove all chocks. Carefully back the vehicle
o the rack.
2.1. Chocking Procedure
Read and thoroughly familiarize yourself with these instruc-
ons before operang the li. Adjust the turning angle
gauges (with lock pins installed) to match the tread width
of the vehicle.
CAUTION
For safety, proper chocking of vehicle wheels
is very important to prevent the vehicle from
rolling while posioned on elevated runways.
Drive the vehicle onto the rack, place the transmission in
PARK, and SET the emergency brake. Place a wheel chock
at the front and rear of the le rear wheel. Leave the wheel
chocks in place while elevang the li, performing service
operaons on the vehicle, and while lowering the li. Aer
lowering the li, remove the wheel chocks from the front
and rear of the re before moving the vehicle.
2.2. Unlock and Lock Slip
Plates with PowerSlide Slip
Plates (Optional)
Connect a Burndy cable from aligner to controller for auto-
mac turnplate operaon.
Use turnplate status selecon knob for manual use.
3. Jack Operations (Optional)
3.1. Preparing the Vehicle for
Lifting
NOTE
See Manufacturer recommendaons: Secon:
Intro to Ops in RM07952-00 HD Jack Opera-
ons
Drive the vehicle onto the rack so that it is approximately
centered from side to side on the rack.
Do NOT apply parking break. Chocking is NOT recommen-
ded.
P490/P491HD Pit Rack Operation Manual
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3.2. Jacking Procedure
Slide the jack to the approximate vehicle manufacturer’s
specied jacking point.
Jacking beams with mechanical locks (oponal): When re-
leased (control valve fully down), always stop lowering (close
the release) before reengaging the mechanical locks
The lock valve in each cylinder nut is for operang the
cylinders individually in order to keep the load horizontally
by opening or closing the valves. The cylinder will neither
li nor lower with the valve closed. See warnings 8, 9 and
10! The release located in the center of the control panel is
used for lowering.
The control valve located on the right center of the control
panel controls liing, and lowering without load. Mechanical
locks (oponal): The two mechanical locks on each cylinder
will lock (engage) automacally when liing or lowering. The
locks are released by connually turning the control valve
fully down. If the locks are engaged it is necessary to li a
few cm to allow releasing.
Liing: Check that both lock valves are open. See warnings
8, 9 and 10! Turn the control valve upwards. First stage
is air-operated high-speed approach. Turn further and the
air-motor starts for power li operaon. Use the lock valves
to keep the load horizontally: close the cylinder having the
correct height and then adjust the height of the other cylin-
der by liing or lowering.
CAUTION
Failure to jack the vehicle at the proper loca-
ons can result in serious structural damage to
the chassis and/or personal injury.
Posion cylinders to desired locaon.
CAUTION
Never posion both cylinders on one side of
the center line of the jack. If the oponal dif-
ferenal beam adaptor is used, keep the center
of the adaptor on the center line of the jack.
If needed, install extensions supplied with the jack. Choose
the correct saddle for liing point.
CAUTION
Never install mulple extension adaptors in
one cylinder. Only one extension per cylinder
may be used at any me.
Always use saddles when extensions are nee-
ded.
Check that both cylinders lock valves are fully open.
NOTE
If only using one cylinder, make sure the un-
used cylinder lock valve is fully closed.
CAUTION
When using the oponal dierenal beam
adaptor make sure both lock valves are fully
open.
Turn the control valve upwards to the rst stage to bring the
jack in contact with the vehicle.
Once the jack pads have contacted the vehicle, check that
they are stable before proceeding.
Turn the control valve further upwards to the second stage
to begin liing vehicle.
P490/P491HD Pit Rack Operation Manual
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Make sure the jack cylinders li in unison. If they do not,
adjustment of the lock valves will correct this.
CAUTION
The vehicle must be allowed to run freely dur-
ing liing and lowering (without brakes and in
neutral)
Raise the vehicle to the desired height. Support the vehicle
aer rising to desired height.
3.3. Lowering the Jack
NOTE
See Manufacturer recommendaons: Secon:
Intro to Ops
Check that both lock valves are fully open.
NOTE
If only using one cylinder, make sure the un-
used cylinder lock valve is fully closed.
Carefully open the release by turning the knob counter-
clockwise. Use the lock valves to keep the load horizontal
while lowering.
Aer the load on the cylinders is removed, turn the con-
trol valve handle downwards to lower the rams completely
while keeping release knob open.
4. Position Runway
Use liing equipment to move and posion runway. Ensure
Jack rails are inboard side on runway.
Carefully li and posion one runway suspended above its
front pedestal.
Jack the pedestal to the runway for pedestal aachment.
Secure the pedestal to the runway aaching the mounng
plate and two 74-653-2 bolts.
P490/P491HD Pit Rack Operation Manual
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Be sure to observe 5/8 spacing as show in below image.
With the pedestal aached, place a cart under the pedestal.
Using a forkli carefully roll the runway into pit.
Roll the runway out over the second pedestal using liing
straps.
Secure the pedestal to the runway using the mounng plate
and two 74-653-2 bolts.
Be sure to observe 5/8 spacing as shown in previous draw-
ing.
5. Regular Maintenance
5.1. Jack Schedule
Weekly • Clean both rams and apply SAE 30 Oil (see g-
ure below). Check proper operaon of control levers. Verify
two handed operaon of raise/lower controls. Check for air
leak. Check that the locks are fully engaging and unlocking
at the correct mes. Check that pivot lock pins are undam-
aged and lock and unlock freely. Verify that counter balance
spring is funconal. Perform general structural check for
damage.
Monthly
• Apply SAE 30 Oil to linkage pins and levers Annually
• Apply 3 shots of Moly-Grease to each ng on both
sides of the jack channel assembly. Apply 1-2 shots of Mo-
ly-Grease to each ng on both sides of the lower cylin-
der assembly with jack fully extended (see gure below).
Composite cylinders without grease ngs do not require
annual lubricaon.
P490/P491HD Pit Rack Operation Manual
Page 7 of 8

5.2. Warranty Information
Hunter Engineering Company warrants new equipment to
be free from defects in material and workmanship under
normal condions of use for a period of three (3) years
from the date of installaon. Excepons to this warranty are
listed below:
• Field labor is covered under this warranty for a period of
six (6) months.
• ADASLinkTM units carry a one (1) year warranty and
remain under warranty as long as a subscripon is main-
tained there aer.
• DAS 3000 units, including electronic circuit boards, carry
a one (1) year warranty.
• Printers carry a one (1) year warranty.
• Normal consumables and wear items are not covered.
Excepon is baeries, which are warranted for a period of
six (6) months.
• Product that has been subject to abuse, misuse, altera-
ons, accident, exposure to the elements,tampering, un-
reasonable use, or not maintained in a reasonable or nec-
essary manner.
• Replacement parts purchased through the Hunter Service
Center and no longer covered by machine warranty are
warranted for a period of six (6) months.
In case of any warranty claim, it will be necessary to con-
tact your local authorized Hunter Service Representave. To
have an item considered for warranty, it must be returned to
Hunter Engineering Company for inspecon and evaluaon.
This must be done on a freight prepaid basis. If aer our
inspecon the product proves to be defecve, and is within
the me frame specied, we will repair or replace the item
at no addional cost.
This is Hunter Engineering Company’s only warranty with
respect to new equipment. Hunter Engineering Company
disclaims all other warranes to the extent permied by
law. This express warranty and any implied warranes of
merchantability and tness for a parcular purpose shall
not extend beyond the warranty period. Hunter Engineer-
ing Company is not responsible for any incidental or con-
sequenal damages, including, but not limited to, loss of
business.
We do not authorize any person to assume for us any other
liabilies with our products. Any remaining warranty may
be transferred to subsequent purchasers by forwarding the
purchaser’s name, address,phone number and equipment
serial number to:
See our document library at www.Hunter.com for addional
details.
Hunter Engineering Company | Customer Service De-
partment
11250 Hunter Drive, Bridgeton, MO 63044
[phone]
Form 3221-T, Updated: 06-2021, Supersedes 12-17a
P490/P491HD Pit Rack Operation Manual
Page 8 of 8

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