UMS Users Manual»

UMS Users Manual»
Chief Universal
Measuring System
OWNERS MANUAL
R
1999 © Chief Automotive Systems, Inc.
Chief’s Limited One-Year
Warranty & Liability
CHIEF'S LIMITED ONE-YEAR
WARRANTY & LIABILITY
Chief Automotive Technologies, Inc. warrants for one year from date of installation
and/or purchase any of its products which do not perform satisfactorily due to defect
caused by faulty material or workmanship. Chief’s obligation under this warranty is
limited to the repair or replacement of products which are defective and which have not
been misused, carelessly handled, or defaced by repair or repairs made or attempted by
others.
CHIEF AUTOMOTIVE TECHNOLOGIES, INC. DOES NOT ASSUME
RESPONSIBILITY FOR ANY DEATH, INJURY OR PROPERTY DAMAGE
RESULTING FROM THE OPERATOR’S NEGLIGENCE OR MISUSE OF THIS
PRODUCT OR ITS ATTACHMENTS. CHIEF MAKES NO WRITTEN,
EXPRESS OR IMPLIED WARRANTY WHATSOEVER OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE
REGARDING THE EQUIPMENT OR ANY PART OF THE PRODUCT OTHER
THAN THE LIMITED ONE-YEAR WARRANTY STATED ABOVE.
UNIVERSAL MEASURING SYSTEM
OWNERS MANUAL
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INTRODUCTION
The Chief Universal Measuring System (UMS) is a
precision tool that offers unlimited measuring
capabilities. It provides a simple yet highly practical
technology to auto body repair, one that can be
applied to any type of vehicle whether it be of
‘unitized body construction’ (with or without struts)
or ‘perimeter frame construction’. It works equally
well on pickup trucks, vans and all other utility
vehicles.
Once installed, the UMS shows misalignment
relating to the vehicle’s ‘Centerline/Plane’ and
‘Datum Line/Plane’. (See Figure 1.) The Centerline/
Plane is a vertical plane that divides a structure in
half lengthwise. It is referred to when determining
lateral misalignment. The Datum Line/Plane is a
horizontal plane located a specified distance below
the structure. It is used when determining vertical
misalignment of the end sections of the vehicle.
In addition to measuring the extent of damage, the
UMS monitors the repair until correct alignment is
achieved. During corrective pulls, pointers and scales
may need to be moved from damage; however, they
are easily returned for monitoring and verification of
the repair.
In addition to offering step-by-step procedures for
setup and usage of UMS equipment (and some
optional accessories), this owners manual also
provides a detailed explanation of the symbols, codes,
and anchoring data that appears in Chief’s UMS
Data Books. (See Page 12.) Refer also to “PDF”
entitled Sample Specification Sheet. For reference
purposes there is also a breakdown of UMS
Component Terminology. (See Figure 2-Page 2.)
Proper handling and storage of the Chief Universal
Measuring system assures prolonged calibration and
usefulness of the equipment. It is constructed of
high-grade aircraft aluminum and is designed to
stand up under conditions normally found in a body
shop environment.
CAUTION: 1) Always wear safety glasses when
using UMS and its optional
accessories.
2) UMS aluminum components will
conduct electricity so keep extrusions away from power lines or
other sources of electrical output.
!
Figure 1
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UMS COMPONENT TERMINOLOGY
NOTE: Refer to the Illustrated Parts
Manual for complete
description and part numbers.
Figure 2
1. Main Ladder Assembly.
13. Vertical Scales.
2. Secondary Ladder Assembly (left side identified).
14. Cones and Fittings:
A = Large Cone, 4
B = Medium Cone, 8
C = Small Cone, 6
E = Socket (two each of fourteen sizes from 9mm
to 24mm)
F = Step Block for measuring pinchwelds, 2
G = Right Angle Block, 4
H = Vertical Scale Springs, 4
3. Overhead Bar.
4. Vertical Leg Assembly (left side identified).
5. Overhead Bar Mounting Assembly — Left Side.
6. Overhead Bar Mounting Assembly — Right Side.
7. Rigid Tram.
8. Telescoping Tram.
15. Vertical Scale Holder. Note the spacing between
the two holes is 150mm. This allows a
measurement of more than 600mm. One
Centerline Bar is fitted with two single-hole
scale holders to accommodate measurements in
center area of bar. These single-hole scale
holders may be used on any of the Centerline
Bars.
9. Upper Scale Guide Assembly. 9A. Upper Scale
Pin.
10. 228mm Datum Bar Assembly — 2.
11. Centerline Bar (left side identified).
a) Three 600mm bars with scale holders.
b) One 450mm bar with scale holders.
16. Asymmetrical Vertical Scale Holder (optional).
12. Vertical Receptacles. Six different sizes.
Receptacle and Scale Assembly (Item 13) only,
not to be separated.
17. Ball Joint Locator (optional).
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SETTING UP THE MEASURING SYSTEM
4. Refer to specifications sheet’s
or
symbols
at the control points (X). Select appropriate
vertical receptacles, vertical scales and fittings,
and insert them into the holders. For these
centerline bars only, remove vertical scale pins
from the tubes and insert a coil spring. Reinsert
and compress pins.
CAUTION: DO NOT loosen screw knobs as
this will discharge vertical scale pins.
1. Select appropriate specification sheet from Data
Books.
2. Place main ladder under portion of vehicle to be
measured (front or rear). (See Figure 3.)
IMPORTANT: Ladder support bars may be
needed when installing the Universal
Measuring System aboard some pulling
systems. (Check with a Chief Automotive
Systems, Inc. representative as per specific
applications.) Ladder support bars (see Pages
10 and 11) position the UMS ladder assembly
at the correct height relative to the anchoring
equipment being used.
!
5. Position one centerline bar under the vehicle at its
designated control points (X).
IMPORTANT: One side of each centerline bar
assembly is labeled ‘left side’. This side MUST
BE positioned on main ladder directly below
left side of vehicle.
6. Shift main ladder and centerline bar until fitting
aligns with designated control point (X) on
vehicle. Loosen knob that secures vertical scale
and fitting and adjust these components until
fitting seats firmly with vehicle. DO NOT
retighten the knob as spring-loaded scale will
hold fitting in place. Move to other side of vehicle
and repeat the procedure.
NOTE: Due to the automobile manufacturing
tolerances, centerline dimensions may vary
slightly from vehicle to vehicle. If fitting on
opposite side of vehicle does not align at its
designated control point (X), loosen vertical
scale holder on that side of vehicle and slide
it until fitting does fit. Note difference
between centerline dimensions and change
each side one-half of the difference. For
example: If vehicle is 2mm wider than
specification sheet calls for, widen each side
of centerline bar scale by 1mm.
Figure 3
3. Select two centerline bars (see Figure 4) and
secure vertical scale holders at prescribed left
side and right side centerline dimensions.
IMPORTANT: Prescribed centerline dimensions
are noted on the specification sheet — see (X)
locations — control points. The two centerline
bars noted in this step will be the first two
attached to the main ladder. If more than one
of the four control points (X) has sustained
damage, select another point for installation
purposes. The centerline bar(s) can be
returned to the control points (X) after the
damage has been corrected.
7. Repeat Steps 5 and 6 for second centerline bar.
8. Tighten knobs securing centerline bars to main
ladder, left side first. The main ladder is now
squared to the vehicle.
NOTE: In extreme cases, centerline dimensions
may vary considerably from specification
sheet, and it may be desirable to place a
third centerline bar at another position to
verify correct position of main ladder in
relation to true centerline of vehicle.
Secure Vertical
Scale Holders at
prescribed
centerline
dimensions.
9. Install additional centerline bars (following Steps
3 and 4) for measuring other points under the
vehicle.
Figure 4
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10. Length measurements are accomplished with
sliding tapes located on both sides of main
ladder. When taking a length measurement at
rear of vehicle, set zero point of left side tape at
scribe line of front centerline bar and read length
at scribe lines of centerline bars at rear of
vehicle. When taking a length measurement at
front of vehicle, set zero point of left side tape at
scribe line of rear centerline bar and read length
at scribe lines of centerline bars at front of
vehicle.
NOTE: 1) When reading length on right side of
vehicle, follow same procedures;
however, refer to rear edge of
centerline bar guides instead of
scribe lines.
2) Due to automobile manufacturing
tolerances, length between control
points may vary slightly from vehicle
to vehicle. Generally, any deviation
of length found in this area should
be carried out through rest of
vehicle. For example: If vehicle is
4mm longer than data sheet calls for
between control points, add 4mm to
remainder of length dimensions.
13. Adjust overhead bar mountings on vertical legs to
setting inside this symbol
. (See Figure 6.)
For example:
.
OVERHEAD BAR MOUNTS
Figure 6
14. Slide vertical legs onto secondary ladder and slide
to the ‘stops’. Tighten vertical legs to secondary
ladder. (See Figure 7.)
VERTICAL LEGS
11. All length measurements to secondary ladder
must be done on left side. Set tape on main ladder
to length indicated by
.
This number
appears under scribe line of centerline bar at rear
control point.
Left Side
Vertical
Leg
(Left
Side)
12. Position secondary ladder on main ladder with
scribe line over zero point of tape. (See Figure 5.)
Rear
Left Side
Zero Point
Figure 7
15. To install overhead bar, slide bar into left side
mounting (spring loaded) to the ‘stop’. (See
Figure 8.) Attach overhead bar to right side
mounting using ‘captured screws’ on bar
assembly.
Secondary Ladder
Figure 5
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18. Position fittings firmly to vehicle. Then,
tightening left side first, secure secondary ladder
to main ladder.
OVERHEAD BAR
Spring Loaded Mount
Left Side
19. Most underhood points which are forward of the
overhead bar are measured with rigid tram. To
use rigid tram, remove one of the upper scale
pins. Insert pin on rigid tram into upper scale
guide and tighten screw knob on back side of
guide. (See Figure 10.)
Rigid Tram
Figure 8
16. Adjust upper scale guides to centerline dimensions. (Directly above
symbol on specification
sheet.) (See Figure 9.)
Upper Scale Guide
Figure 10
20. Adjust upper scale guide to prescribed centerline
dimension.
21. Adjust vertical scale holder on rigid tram to
prescribed length.
22. Using same procedure that is used under the
vehicle, select appropriate vertical scale receptacle, vertical scale and fitting and insert into
vertical scale holder. Lower fitting to vehicle.
NOTE: Whenever possible, leave one of the
overhead bar’s upper scale pins in contact
with vehicle. This helps to maintain rigidity
of upper system.
Figure 9
23. To measure opposite side of vehicle, remove upper
scale pin from the other guide. Position guide at
proper centerline dimension and insert rigid tram
into the block.
17. Insert upper scale pins into upper scale guides.
Use the fitting designated in the
symbol. The
number in this symbol is the vertical dimension
at these positions.
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UPPER BODY MEASURING
24. The UMS also features a telescoping tram that
attaches to hole in center of overhead bar. It may
be used to check upper body structure for
symmetry. (See Figure 11.)
The components of the Universal Measuring
System can be used to take comparison
measurements of some upper body locations. For
example: overhead bar may be passed over or
through body of vehicle to measure roof, hinge posts,
latch posts, windshield openings, etc.; or, overhead
bar may be bridged over rear of vehicle where rigid
tram and telescoping tram can be used to measure
rear gate or hatchback openings or interior structural
components such as rear strut towers or package
shelves.
Telescoping Tram
Although UMS components can be used to reach
and measure such upper body locations, Chief
recommends the use of its Upper Body Measuring
Package. The equipment in this package extends the
UMS capabilities allowing for a greater range of
upper body measuring. The package also includes a
full line of upper body specifications.
Figure 11
228MM DATUM BAR/DATA CHART
UNDERHOOD MEASURING
The 228mm Datum Bar is designed for the UMS
secondary ladder. The 228mm Bar measures points
that are otherwise inaccessible when using the
secondary ladder. (See Figure 12 — Page 7.)
1. Referencing tape on left side, position secondary
ladder on main ladder with scribe line over length
indicated by
. Tighten left side first when
securing secondary ladder to main ladder.
The 228mm Bar Data Chart (see Figure 13) is
located in lower left corner of specification sheet. The
228mm Bar has receptacle holes labeled ‘X’, ‘Y’, and
‘Z’. (See labeling instructions to convert former
228mm Bars to the ‘X’, ‘Y’, ‘Z’ format.) The 228mm
Bar Data Chart has five columns: Position,
Receptacle, Length,
Vertical, and
Vertical.
2. Repeat Steps 13 through 16 — Pages 4 and 5.
3. Note direction of arrow
or
under
symbol.
Insert upper scale pins into upper scale guides in
direction indicated by arrow, use fitting called for
in this symbol. The number in this symbol is
vertical dimension (always read at top of scale
guide) at these positions.
The ‘X’ ‘Y’ ‘Z’ 228mm Bars, and the ‘X’ ‘Y’ ‘Z’ 228mm
Bar Data Chart eliminates calculations and
conversions by technicians. To use, simply set the
bars and vertical scales according to specifications in
the 228mm Bar Data Chart.
4. Use rigid tram to measure all points that are
forward of overhead bar. Length settings for
vertical scale holder on rigid tram
are
located just below vehicle drawing.
Each position number on the 228mm Bar Data
Chart correlates with the same position number on
the underbody portion of the specification sheet. To
use the 228mm Datum Bar and Chart, refer to Figure
13 (Page 7) and read Examples ‘X’, ‘Y’, and ‘Z’ (Page
8).
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228mm Datum Bars
Figure 12
SAMPLE SPECIFICATION SHEET
Figure 13
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Example X
Example Z
(Refer to Figure 13-Page 7 and Figure 14 below.)
(Refer to Figure 13-Page 7 and Figure 16 below.)
1. a) Select position number to be measured. (For
example: Position No. 11.)
b) Set scribe line (under Y) at designated length
(150mm). (See Figure 14.)
c) Select vertical scale designated in vertical
column (334). In this instance, the 284-530
scale is appropriate.
d) Insert vertical scale into ‘X’ receptacle hole
(toward front of vehicle) using a B cone.
e) Centerline is read at scribe line on front of
228mm Bar.
2. a) Select position number to be measured. (For
example: Position No. 16).
b) To measure to ‘Z’ position, remove scale holder
from 228mm Bar and rotate one-half turn.
Set scribe line under Y at length designated
(135mm). (See Figure 16.)
c) Select vertical scale designated in vertical
column (352mm).
d) Insert vertical scale into Z receptacle hole
(toward rear of vehicle) using a 15mm socket.
e) Centerline is read at scribe line on front of
228mm Bar.
EXAMPLE X
EXAMPLE Z
Left Side
Left Side
Set "Y" at 150mm
Set "Y" at 135mm
Figure 14
Figure 16
Example Y
Length is always set at scribe line labeled ‘Y’.
‘X’ dimensions are measured with vertical scale in
receptacle hole labeled ‘X’ (toward front of vehicle).
‘Y’ dimensions are measured with vertical scale in
receptacle hole labeled ‘Z’ (toward rear of vehicle).
‘Z’ dimensions are measured with vertical scale in
receptacle hole labeled ‘Z’ (toward rear of vehicle).
(Refer to Figure 13-Page 7 and Figure 15 below.)
2. a) Select position number to be measured. (For
example: Position No. 13).
b) Set scribe line (under Y) at designated length
(98mm). (See Figure 15.)
c) Select vertical scale designated in vertical
column (142mm).
d) Insert vertical scale into Y receptacle hole
using a B cone.
e) Centerline is read at scribe line on front of
228mm Bar.
NOTE: 1) Vertical dimensions designated in
228mm Bar Data Chart have taken
into consideration the 32mm height
difference which exists when using
228mm Bars. (No calculations are
necessary and vertical scale should
read as per 228mm Bar Data Chart.)
EXAMPLE Y
2) Centerline dimensions remain unchanged. They are the same as when
using a centerline bar.
Left Side
Set "Y" at 98mm
Figure 15
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LADDER SUPPORT BARS
Ladder support bars may be needed when installing
the UMS ladder assembly aboard some pulling
systems. (Check with a Chief Automotive Systems,
Inc. representative as per specific applications.)
Ladder support bars position the UMS ladder
assembly at the correct height relative to the
anchoring equipment being used.
When using ladder support bars, follow these
procedures:
Figure 19
5. Place ladder assembly on ladder support bars.
(See Figure 20.)
1. Retract the screws on the ladder support bars so
that each screw is flush with bottom of laddersupport bar flange.
2. Apply decals 1, 2, and 3 to ladder support bars,
one decal per bar. (See Figure 17.)
Decal
Figure 17
Figure 20
3. Place three ladder support bars on pulling system
rack. The No. 1 bar should be placed at front of
rack with decal on left side of vehicle. (See Figure
18.)
NOTE: A fourth ladder support bar should be
used when the 4-foot ladder extension
(optional accessory — see Page 11) is
being used.
6. Place two pinchweld clamp stands on the rack,
centered with the No. 2 bar. (See Figure 21.)
Front
Figure 21
Left Side
7. Using a centerline bar (48 inch), set two vertical
scale holders at a centerline of 500mm. Install a
150-260mm vertical scale, fitted with a ‘C’ cone,
in each of the vertical scale holders. Set both
vertical scales at 176mm. Place centerline bar as
close to the No. 2 ladder support bar as possible,
leaving enough room to adjust the bar. (See
Figure 22 on Page 10.)
Figure 18
4. Place second set of decals on rack matching the
numbers on ladder support bars. (See Figure 19.)
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UMS SUGGESTIONS
• UMS is a calibrated precision instrument
machined and manufactured for easy operation.
DO NOT use force when assembling or moving
UMS parts.
• Unless there is collision damage at control
points (X), UMS may remain in contact with these
points at all times. Spring-loaded scales secure
fittings to the control points (X).
• During corrective pulls, disengage UMS
components from damaged areas of vehicle.
• Upon completion of repairs, dismantle UMS, and
return its components to the storage rack. Proper
handling and storage of UMS components will
assure prolonged calibration and usefulness of the
equipment.
CAUTION: When installing or dismantling
UMS, handle spring-loaded
scales carefully. Remove
springs from scales when
dismantling system.
Figure 22
8. Place overhead bar across top of clamps, directly
over ‘C’ cones. (See Figure 23.)
!
• DO NOT tamper with any UMS screws.
NOTE: This does not apply to top front screw on
upper scale guide nor to screws that are
fitted with knobs.
• When welding or using cutting-torch near UMS,
protect UMS components from sparks and slag!
• Although UMS has an anodized finish, some
chemicals (such as battery acid) may be harmful
to the finish.
Figure 23
9. Adjust No. 2 ladder support bar screws until both
right and left ‘C’ cones are making contact with
bottom of overhead bar.
• Diagnostic worksheets for ‘lower body/underhood’
(Part No. 150296) and ‘upper body’ (Part No.
150297) are available from Chief Automotive
Systems, Inc., 800-445-9262.
10. Repeat Steps 6-9 at ladder support bars No. 1
and No. 3.
11. After all three ladder support bars have been
adjusted, check main ladder to be sure it is
resting upon support bars. Then tighten jam
nuts on each of the adjustment screws.
12. Place ladder support bars in the same position
every time UMS is to be used on this rack.
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ASYMMETRICAL VERTICAL SCALE
HOLDER (OPTIONAL ACCESSORY)
1. Work on side of vehicle with least damage first.
2. Position centerline bar at length indicated on data
sheet. The symbol
indicates length from
rear zero point to center of ball joint.
3. Place ball joint locator on centerline bar. (See
Figure 25.)
4. Slide locator and raise pointer as needed to locate
center of ball joint.
5. Tighten knob to hold pointer in place while moving
locator to opposite side of vehicle.
6. Compare location of ball joints.
Asymmetrical vertical scale holder is used when
corresponding right and left dimensions are
asymmetrical at a given position (within 100mm).
(See Figure 24.)
Centerline Bar
Distance equal to the
difference between
right and left length
dimensions. (To
measure opposite
direction, remove scale
and rotate 180°.)
4-FOOT LADDER EXTENSION
(OPTIONAL ACCESSORY)
The 4-foot ladder extension provides greater
flexibility in regard to length measurements.
Existing UMS measuring tapes extend onto its
extrusions making it possible to measure the entire
length of most vehicles.
Main Ladder
Right Side
Figure 24
1. Remove flat head socket screws from inserts and
slide inserts into extrusions of 4-foot ladder
extension. Then align holes in insert with predrilled holes in extrusions and reinsert the
screws. (See Figure 26.) DO NOT tighten the
screws at this time.
1. Position centerline bar on main ladder at length
specified for left side.
2. Place asymmetrical holder on right side of
centerline bar as shown in Figure 24.
3. Position asymmetrical holder at specified
centerline dimension and clamp in place.
4. Slide scale forward or rearward a distance equal
to the difference between right and left length
dimensions. (To measure opposite direction,
remove scale and rotate 180°.)
5. Tighten knob to hold scale at desired dimension.
Inserts
4-Foot Ladder Extension
Flat Head
Socket Screws
BALL JOINT LOCATOR
(OPTIONAL ACCESSORY)
Slide locator and raise pointer
as needed to locate center of
ball joint.
Figure 26
2. Slide measuring tapes away from plastic caps at
ends of main ladder extrusions. This exposes four
flat head socket screws (two per extrusion).
Retract the screws and remove the plastic caps.
3. Connect the assemblies by sliding the inserts
(notched ends) into the main ladder extrusions.
Then retighten the flat head socket screws on the
main ladder and 4-foot extension. Reinstall
plastic caps at far end of 4-foot ladder extension.
Main Ladder
Centerline Bar
Figure 25
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EXPLANATION OF SYMBOLS —
UMS SPECIFICATION SHEET
j) X’s indicate preferred positions to place first two
centerline bars which square system to vehicle.
NOTE: 1) Refer to UMS specification sheets and to
“PDF” entitled Sample Specification
Sheet.
2) Left side is always at bottom of specification sheet, and front of vehicle is to
left of specification sheet.
k) The first two centerline bars become ‘0mm’
reference points for length dimensions. The front
bar scribe line is zero point for measuring length
at rear of vehicle using tape on left side. The rear
bar scribe line is zero point for measuring length
at front of vehicle using tape on left side .
a) Centerline dimensions are found in center areas of
vehicle drawings. Always check left side and right
side dimensions.
NOTE: When reading length on right side,
follow same procedures; however, refer
to rear edge of centerline bar guides
instead of scribe lines.
NOTE: A
symbol indicates centerline
dimension which is greater than the
length of the centerline bar. When this
symbol appears, insert vertical scale
receptacle in outer hole of vertical scale
holder and adjust vertical scale holder to
prescribed centerline dimension using
inner scribe line.
b) A circle
c) A hex
d) A square
to an edge.
l) A pair of brackets (
) found in line connecting
vertical scale symbols
to vehicle
drawing indicates use and setting of asymmetrical
scale holder (optional accessory — see Page 11).
(Asymmetrical scale holder is used only on
passenger side under vehicle.)
m) The
symbol indicates use of ball joint locator
(optional accessory — see Page 11), usually
indicating length to center of ball joint from rear
zero point. (It may also indicate other dimensions
which are measured with ball joint locator.)
indicates measurement to a hole.
indicates measurement to a bolt.
indicates use of ‘F’ block to measure
NOTE: For letters n-r, refer to underhood drawing
on sample specification sheet.
e) If both circle and hex are shown at same point, hex
is for measuring to bolt (with part installed), and
circle is for measuring to bolt hole (with part
removed).
f) A hole is indicated by a circle ‘
g) A bolt is indicated by a ‘
’ or ‘
n) The
symbol is length setting from rear zero
point for placement of secondary ladder.
o) The number in
symbol shows vertical setting
for overhead bar mountings on vertical legs. For
example:
.
’.
’.
p) The
symbol indicates vertical dimension of
upper scale pin and fitting to be used. For
example:
.
h) The bottom number in circle
or hex
is
vertical dimension. This number also indicates
size of vertical scale to be used. For example:
requires use of 110-185mm scale.
q) The numbers indicated on horizontal line
underhood drawings indicate length settings for
scale holder on rigid tram.
i) Letter at top of circle or hex designates fitting to
be used on vertical scale. An ‘E’ (socket) is followed by a number designating size of socket. A
‘G’ (right angle block) is followed by another letter
designating fitting to be used on right angle block.
r)
12
A circle and hex located above underhood
drawings, control vertical dimensions and fitting
requirements for vertical scale used on rigid
tram.
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ANCHORING INFORMATION
EXPLANATION OF CODE BOX
Many of the specification sheets in UMS Data
Books feature important ‘anchoring’ information.
Chief’s UMS pinchweld stands (with special
adapters); Universal Anchoring Stands (with UMS
adapter tubes and special adapters); and, Universal
Holding System (with special adapters) not only
secure a vehicle to a variety of pulling systems, but
also position the vehicle at the prescribed height for
using this measuring system. Use the following
guidelines to ensure correct placement of anchoring
equipment.
NOTE: Refer to “PDF” entitled Sample Specification
Sheet.
The following explanation of the Code Box (which
appears on all UMS Specification Sheets) is based on
measurements obtained in the Chief Automotive
Systems, Inc. Research Facility. The purpose of codes
is to help technicians isolate collision damage from
normal vehicle-to-vehicle dimensional variations.
(See sample Code Box — Figure 27.)
D = Number following ‘D’ indicates most extreme
deviation found in datum (vertical) dimensions.
1) Locate specification sheet for vehicle to be
measured and inspect it for special clamping
instructions. Special clamping instructions are
located at bottom of specification sheet and/or on
back of specification sheet.
For example: If greatest variation in datum
exists at position No. 25 (observed dimensions
vary from 200mm to 205mm) dimension listed on
specification sheet will be an average of the two
dimensions (202.5mm). Therefore, a code of D5
indicates a datum variation of no greater than
plus or minus 2.5mm was found to exist
throughout entire vehicle.
• If special instructions are indicated, follow
procedures indicated on specification sheet.
• If special instructions are not indicated,
position anchoring clamps at ends of rocker
panels and proceed with Steps 2-7.
C = Number following ‘C’ indicates most extreme
deviation found in centerline dimensions.
2) Inspect the inside of pinchwelds for fuel lines,
brake lines, or other items which may interfere
with placement of clamps. Remove undercoating
from pinchweld.
L = Number following ‘L’ indicates most extreme
deviation found in length dimensions.
3) Work on one side of vehicle at a time starting
with least damaged side first. Raise vehicle high
enough to remove wheels and place clamps under
the pinchweld.
D5C7L8
Figure 27
4) Lower vehicle until rocker panel pinchweld fits
into clamps.
IMPORTANT: Bottom surface of rocker panel
MUST BE firmly against top surface of
clamps.
5) Tighten clamp jaw bolts. (Torque to 100 ft. lbs.
maximum.)
6) Tighten clamp mounting bolts.
7) Repeat Steps 2-6 on opposite side of vehicle.
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ANCHORING HEIGHT ADJUSTMENTS (IF NEEDED)
Install Universal Measuring System (UMS) as per its
specification sheet and measure height of four base
reference points in vehicle’s center section. Then compare
measurements of both front and rear points with their
specifications. (See example - Figure 28.)
NOTE: If diamond or twist exist in center section, follow
prescribed procedures for measuring and correcting.
Center Section Base Reference Points
Once differences are equal from front of center section to
rear, all other datum height measurements can be
gathered and adjusted by the same amount.
NOTE: If it is impossible to match the front and rear differences, get them as close as possible and then average
the resulting numbers. (See example - Figure 29.) In
this example, all other datum height measurements
would then be adjusted by 23mm.
Center Section Base Reference Points
Actual
Specifcations
Measurements
Difference
Front
300mm
280mm
+ 20mm
Rear
420mm
390mm
+ 30mm
Figure 28
To use UMS successfully, the difference between actual
measurements and specifications must be identical (or
nearly identical) from front of center section to rear. To
adjust the vehicle referenced in Figure 28, a technician
could try one of the following:
• Elevate front anchoring location 10mm to create a difference of +30mm at both front and rear.
• Lower rear anchoring location 10mm to create a difference of +20mm at both front and rear.
• Elevate front anchoring location 5mm and lower rear
anchoring location 5mm to create a difference of +25mm
at both front and rear.
NOTE: Height adjustments techniques will vary dependent
upon anchoring equipment used.
14
Actual
Specifications
Measurements
Differences
Front
300mm
280mm
+ 20mm
Rear
420mm
394mm
+ 26mm
average +23mm
Figure 29
The amount of deflection in a vehicle’s end section will vary
dependent upon anchoring locations selected. Although
the amount of this deflection can not be predetermined, it
will be equal one side of vehicle to the other. For example:
If amount of deflection is 12mm on both sides of rear
section, and there are no visual indications of damage, the
deflection is likely due to anchoring.
NOTE: Chief specifications are obtained from vehicles that
are anchored at specific points and at specific heights
which unload the suspension.
R
P.O. Box 1368
Grand Island, Nebraska 68802-1368
308-384-9747
Chief reserves the right to alter product specifications
and/or package components without notice.
Form UMS Rev. 4/07
Part No. 150022
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