Landoll 325C User manual

MODEL 325C/326C/327C/329C
DETACHABLE TRAILER
OPERATOR’S MANUAL
1900 North Street
Marysville, KS 66508
[phone]
F-490-1107 11/07

MODEL 325C/326C/327C/329C
DETACHABLE TRAILER
OPERATOR’S MANUAL
PURCHASED FROM: DATE / /
ADDRESS:
PHONE NO.: SERIAL NO.:
i

REPORTING SAFETY DEFECTS
If you believe that your vehicle has a defect which could cause a crash or could
cause injury or death, you should immediately inform the National Highway Traffic
Safety Administration (NHTSA) in addition to notifying Landoll Manufacturing.
If NHTSA receives similar complaints, it may open an investigation, and if it
finds that a safety defect exists in a group of vehicles, it may order a recall and
remedy campaign. However, NHTSA cannot become involved in individual prob-
lems between you, your dealer, or Landoll Manufacturing.
To contact NHTSA, you may either call the Auto Safety Hotline toll-free at 1-800-
424-9393 (or 366-0123 in Washington, D.C. area) or write to: NHTSA, U.S. Depart-
ment of Transportation, Washington, D.C. 20590. You can also obtain other infor-
mation about motor vehicle safety from the Hotline.
In the event of a defect or problem with your LANDOLL equipment, please notify
LANDOLL CORPORATION:
LANDOLL CORPORATION
SALES AND SERVICE
1900 NORTH STREET
MARYSVILLE, KANSAS 66508
OR PHONE:
1-800-HAULOLL
(1-800-428-5655)
FAX NO.: [phone]
FOR REPLACEMENT PARTS:
[phone]
1-800-423-4320
FAX NO.: [phone]
ii

TABLE OF CONTENTS
SECTION DESCRIPTION PAGE NO.
1 INTRODUCTION
2 STANDARD SPECIFICATIONS
3 OPERATING INSTRUCTIONS
3-1 GENERAL ...........................................3-1
3-2 PRE-COUPLING OF SEMITRAILER AND TRACTOR ...........3-3
3-3 COUPLING OF THE TRACTOR TO THE SEMITRAILER ........3-4
3-4 CONNECTING TRACTOR SERVICES TO THE SEMITRAILER.....3-4
3-5 TRACTOR AND SEMITRAILER CHECK-OUT .................3-5
3-6 TOWING THE SEMITRAILER .............................3-7
3-7 PARKING THE TRAILER ................................3-8
3-8 UNCOUPLING TOWING VEHICLE FROM SEMITRAILER ........3-8
3-9 GOOSENECK LIFTARM LEVER...........................3-8
3-10 LOAD BLOCKS TRIP LEVER.............................3-9
3-11 TRAILER LIFT LEVER ..................................3-9
3-12 GOOSENECK LOCK HANDLE ............................3-9
3-13 AIR HEIGHT CONTROL VALVE (OPTION) ...................3-9
3-14 HAND VALVE (OPTION) ...............................3-10
3-15 PRESSURE GAUGE ..................................3-10
3-16 AUTOMATIC HEIGHT VALVES (325) ......................3-11
3-17 AXLE LIFT CONTROL VALVE (OPTION) ...................3-12
3-18 HYDRAULIC POWER SUPPLY ENGINE THROTTLE (OPTION) . . . 3-12
3-19 HYDRAULIC POWER SUPPLY ENGINE KEY SWITCH .........3-12
3-20 SWINGOUT OUTRIGGER PLATFORM EXTENSION SET-UP.....3-13
3-21 PREPARATION FOR LOADING AND UNLOADING............3-14
3-22 LOADING THE SEMITRAILER ...........................3-15
3-23 SECURING THE LOAD ................................3-15
3-24 PREPARATION FOR TRANSPORT .......................3-17
3-25 UNLOADING THE SEMITRAILER.........................3-17
3-26 AIR RIDE OPERATION ................................3-19
3-27 DETACHABLE TRUNNION (MODEL 325) ...................3-19
3-28 TRAILER AXLE LIFT (MODEL 325) .......................3-20
3-29 13 FOOT GOOSENECK KINGPIN ADJUSTMENT
(MODEL 329 ONLY)...................................3-20
3-30 HYDRAULIC POWER SUPPLY ENGINE SYSTEM.............3-21
3-31 ANTI-LOCK BRAKE SYSTEM (ABS) ......................3-22
3-32 COLD WEATHER OPERATION ..........................3-23
3-33 HOT WEATHER OPERATION ...........................3-23
4 MAINTENANCE AND LUBRICATION
4-1 MAINTENANCE SCHEDULE .............................4-1
4-2 MAINTENANCE PROCEDURES ...........................4-4
4-3 GOOSENECK, FRAME, AND DECK ........................4-6
4-4 HYDRAULIC SYSTEM ..................................4-6
4-5 ELECTRICAL SYSTEM .................................4-7
4-6 FIFTH WHEEL ........................................4-7
4-7 SUSPENSION MAINTENANCE...........................4-14
4-8 ALIGNMENT ........................................4-17
4-9 BRAKE SYSTEM MAINTENANCE ........................4-20
4-10 HUB AND DRUM MAINTENANCE ........................4-26
4-11 WHEEL BEARING LUBRICATION AND ADJUSTMENT.........4-28
4-12 TIRE MAINTENANCE..................................4-29
4-13 HYDRAULIC ENGINE PACKAGE (OPTION) .................4-31
5 TROUBLESHOOTING
iii

SAFETY PRECAUTIONS
THIS IS THE SAFETY ALERT SYMBOL. IT IS USED TO ALERT YOU
TO POTENTIAL INJURY HAZARDS. OBEY ALL SAFETY MESSAGES
THAT FOLLOW THIS SYMBOL TO AVOID POSSIBLE INJURY OR
DEATH.
DANGER DANGER INDICATES AN IMMINENTLY HAZARDOUS SITUA-
TION WHICH, IF NOT AVOIDED, WILL RESULT IN DEATH OR
SERIOUS INJURY.
WARNING WARNING INDICATES A POTENTIALLY HAZARDOUS SITUA-
TION WHICH, IF NOT AVOIDED, COULD RESULT IN DEATH OR
SERIOUS INJURY.
CAUTION CAUTION INDICATES A POTENTIALLY HAZARDOUS SITUA-
TION WHICH, IF NOT AVOIDED, MAY RESULT IN MINOR OR
MODERATE INJURY.
CAUTION CAUTION USED WITHOUT THE SAFETY ALERT SYMBOL INDI-
CATES A POTENTIALLY HAZARDOUS SITUATION WHICH, IF
NOT AVOIDED, MAY RESULT IN PROPERTY DAMAGE.
iv

1INTRODUCTION
This manual provides operating, servicing, and maintenance instructions for Model
325C/326C/327C/329C detachable trailer, manufactured by Landoll Corporation, Marysville, Kansas 66508.
SECTION 1 gives basic instructions on the use of this manual.
SECTION 2 gives specifications for the trailer, including measurements and component speci-
fications. A Standard Bolt Torque Table is provided to give guidelines for bolt
torques to be used when servicing this product.
SECTION 3 gives instructions for the proper operation of the equipment.
SECTION 4 gives general maintenance procedures, a maintenance schedule, and a lubrication
schedule. Improper maintenance will void your warranty.
IF YOU HAVE ANY QUESTIONS CONTACT:
LANDOLL CORPORATION
1900 NORTH STREET
MARYSVILLE, KANSAS 66508
or phone:
[phone] or
[phone]
or FAX:
[phone]
SECTION 5 is a troubleshooting guide to aid in diagnosing and solving problems with the
trailer.
PARTS LIST is a separate manual showing the various assemblies, subassemblies, and sys-
tems. Refer to that manual when ordering Landoll replacement parts. Order parts
from your Landoll dealer.
WARRANTY The Warranty Registration form is located with the product documents. Fill it out
and mail it within 15 days of purchase. The Warranty is printed inside the front
cover.
NOTE: IMPROPER ASSEMBLY, MODIFICATION, OR MAINTENANCE OF YOUR
LANDOLL EQUIPMENT CAN VOID YOUR WARRANTY.
COMMENTS Address comments or questions regarding this publication to:
LANDOLL CORPORATION
1900 NORTH STREET
MARYSVILLE, KANSAS 66508
ATTENTION: PUBLICATIONS - DEPT. 55
1-1

2STANDARD SPECIFICATIONS
CAPACITY*:
MODEL 325C: ...........................................100,000 LB. DISTRIBUTED
DECK RATING ................................100,000 LB. CONCENTRATED IN 10’
MODEL 326C: ............................................70,000 LB. DISTRIBUTED
DECK RATING .................................70,000 LB. CONCENTRATED IN 16’
MODEL 327C: ...........................................100,000 LB. DISTRIBUTED
DECK RATING ................................100,000 LB. CONCENTRATED IN 16’
MODEL 329C: ...........................................120,000 LB. DISTRIBUTED
DECK RATING ................................120,000 LB. CONCENTRATED IN 10’
PULL OUT EXTENSION MAXIMUM CAPACITY IS ONE HALF FRAME CAPACITY LISTED ABOVE.
GOOSENECK HYDRAULIC TILT
MODELS 325C, 326C, 327C (STD) ............................................ 10'7"
MODEL 329C (STD); 325C, 327C (OPTION) ..................................... 13'-0"
KING PIN SETTING
MODELS 325C, 326C, 327C, 329C (STD) ........................................ 15"
MODELS 325C, 327C, 329C (OPTION);.......................................... 42"
LOADED GROUND CLEARANCE:....................................................8"
LOADED DECK HEIGHT:..........................................................24"
HYDRAULIC HOOKUP:
QUICK COUPLERS ......................................FLAT FACE 3/4" BODY SIZE
MAXIMUM OPERATING PRESSURE** .......................................2500 PSI
OPERATING FLOW**.....................................................17GPM
ELECTRICAL HOOKUP: ............................................7-WAY CONNECTOR
AIR HOOK UP: ............................................COLOR CODED GLAD HANDS
SPECIFIC BOLT TORQUES
AIR RIDE SUSPENSION:
EQUALIZER BEAM PIVOT AND ADAPTER BOLTS
DESIGNATED W/ NEWAY ON BOLT HEAD .............................800FT.-LBS.
DESIGNATED W/ HOLLAND NEWAY ON BOLT HEAD ....................550FT.-LBS.
SHOCK ABSORBER MOUNTING........................................150FT.-LBS.
AIR SPRING MOUNTING: 1/2"...........................................35FT.-LBS.
3/4" ...........................................35FT.-LBS.
WHEEL FASTENERS - ALL MODELS:
OUTER SPINDLE NUTS ...........................................250-400 FT.-LBS.
PILOT WHEEL NUTS .............................................450-500 FT.-LBS.
* CAPACITY RATINGS ARE FRAME CAPACITIES ONLY. ACTUAL LOAD CAPACITIES MAY BE RE-
STRICTED BY FACTORS SUCH AS GROSS AXLE WEIGHT RATINGS (GAWR) OR STATE AND FED-
ERAL REGULATIONS.
** TRACTOR HYDRAULIC POWER SUPPLY MUST BE CAPABLE OF OPERATING AT THIS PRES-
SURE AND FLOW RATE AND BE EQUIPPED WITH A PRESSURE RELIEF VALVE SET AT THIS PRES-
SURE.
2-1

2-2
LANDOLL CORPORATION
GENERAL TORQUE SPECIFICATIONS (REV. 4/97)
THIS CHART PROVIDES TIGHTENING TORQUES FOR GENERAL PURPOSE APPLICATIONS WHEN SPECIAL TORQUES ARE NOT SPECIFIED
ON PROCESS OR DRAWING.
ASSEMBLY TORQUES APPLY TO PLATED NUTS AND CAPSCREWS ASSEMBLED WITHOUT SUPPLEMENTAL LUBRICATION (AS RECEIVED
CONDITION). THEY DO NOT APPLY IF SPECIAL GRAPHITE MOLY-DISULFIDE OR OTHER EXTREME PRESSURE LUBRICANTS ARE USED.
WHEN FASTENERS ARE DRY (SOLVENT CLEANED), ADD 33% TO AS RECEIVED CONDITION TORQUE.
BOLT HEAD IDENTIFICATION MARKS INDICATE GRADE AND MAY VARY FROM MANUFACTURER TO MANUFACTURER.
THICK NUTS MUST BE USED ON GRADE 8 CAPSCREWS.
USE VALUE IN [ ] IF USING PREVAILING TORQUE NUTS.
TORQUE IS SPECIFIED IN FOOT POUNDS
UNC
Size SAE Grade
2
SAE
Grade
5
SAE
Grade
8
UNF
Size SAE Grade
2
SAE
Grade
5
SAE
Grade
8
1/4-20 4 [5] 6 [7] 9 [11] 1/4-28 5 [6] 7 [9] 10 [12]
5/16-18 8 [10] 13 [16] 18 [22] 5/16-24 9 [11] 14 [17] 20 [25]
3/8-16 15 [19] 23 [29] 35 [43] 3/8-24 17 [21] 25 [31] 35 [44]
7/16-14 24 [30] 35 [43] 55 [62] 7/16-20 27 [34] 40 [50] 60 [75]
1/2-13 35 [43] 55 [62] 80 [100] 1/2-20 40 [50] 65 [81] 90 [112]
9/16-12 55 [62] 80 [100] 110 [137] 9/16-18 60 [75] 90 [112] 130 [162]
5/8-11 75 [94] 110 [137] 170 [212] 5/8-18 85 [106] 130 [162] 180 [225]
3/4-10 130 [162] 200 [250] 280 [350] 3/4-16 150 [188] 220 [275] 320 [400]
7/8-9 125 [156] 320 [400] 460 [575] 7/8-14 140 [175] 360 [450] 500 [625]
1-8 190 [237] 408 [506] 680 [850] 1-14 210 [263] 540 [675] 760 [950]
1-1/8-7 270 [337] 600 [750] 960 [1200] 1-1/8-12 300 [375] 660 [825] 1080 [1350]
1-1/4-7 380 [475] 840 [1050] 1426 [1782] 1-1/4-12 420 [525] 920 [1150] 1500 [1875]
1-3/8-6 490 [612] 110 [1375] 1780 [2225] 1-3/8-12 560 [700] 1260 [1575] 2010 [2512]
1/1-2-6 650 [812] 1460 [1825] 2360 [2950] 1/1-2-12 730 [912] 1640 [2050] 2660 [3325]
METRIC
COARSE THREAD METRIC CLASS 10.9 FASTENERS AND CLASS 10.0 NUTS AND THROUGH HARDENED FLAT WASHERS, PHOSPHATE
COATED, ROCKWELL “C” 38-45.
USE VALUE IN [ ] IF USING PREVAILING TORQUE NUTS.
Nominal
Thread
Diameter
mm
Standard Torque Nominal
Thread
Diameter
mm
Standard Torque
Newton-
Meters Foot- Pounds Newton- Meters Foot- Pounds
6 10 [14] 7 [10] 20 385 [450] 290 [335]
7 16 [22] 12 [16] 24 670 [775] 500 [625]
8 23 [32] 17 [24] 27 980 [1105] 730 [825]
10 46 [60] 34 [47] 30 1330 [1470] 990 [1090]
12 80 [101] 60 [75] 33 1790 [1950] 1340 [1450]
14 125 [155] 90 [115] 36 2325 [2515] 1730 [1870]
16 200 [240] 150 [180] 39 3010 [3210] 2240 [2380]
18 275 [330] 205 [245]
Table 2-1 General Torque Specifications

2-3
LANDOLL CORPORATION
HYDRAULIC FITTING TORQUE SPECIFICATIONS
37oJIC, ORS, & ORB (REV. 10/97)
THIS CHART PROVIDES TIGHTENING TORQUES FOR HYDRAULIC FITTING APPLICATIONS WHEN SPECIAL TORQUES ARE NOT SPECIFIED
ON PROCESS OR DRAWING.
ASSEMBLY TORQUES APPLY TO PLATED CARBON STEEL AND STAINLESS STEEL FITTINGS ASSEMBLED WITHOUT SUPPLEMENTAL
LUBRICATION (AS RECEIVED CONDITION).THEY DO NOT APPLY IF SPECIAL GRAPHITE MOLY-DISULFIDE OR OTHER EXTREME PRESSURE
LUBRICANTS ARE USED.
BRASS FITTINGS AND ADAPTERS - 65% OF THE TORQUE VALUE FOR STEEL. STAINLESS STEEL, ALUMINUM AND MONEL - THREADS ARE
TO BE LUBRICATED.
TORQUE IS SPECIFIED IN FOOT POUNDS
PARKER BRAND FITTINGS
Dash
Size 37 Degree JIC O-Ring (ORS) O-Ring Boss (ORB)
-4 11-13 15-17 13-15
-5 14-16 — 21-23
-6 20-22 34-36 25-29
-8 43-47 58-62 40-44
-10 55-65 100-110 57.5-62.5
-12 80-90 134-146 75-85
-16 115-125 202-218 109-121
-20 160-180 248-272 213-237
-24 185-215 303-327 238-262
-32 250-290 — 310-340
LANDOLL CORPORATION
HYDRAULIC FITTING TORQUE SPECIFICATIONS
37oJIC, ORS & ORB (REV. 10/97)
THIS CHART PROVIDES TIGHTENING TORQUES FOR HYDRAULIC FITTING APPLICATIONS WHEN SPECIAL TORQUES ARE NOT SPECIFIED
ON PROCESS OR DRAWING.
ASSEMBLY TORQUES APPLY TO PLATED CARBON STEEL AND STAINLESS STEEL FITTINGS ASSEMBLED WITHOUT SUPPLEMENTAL
LUBRICATION (AS RECEIVED CONDITION).THEY DO NOT APPLY IF SPECIAL GRAPHITE MOLY-DISULFIDE OR OTHER EXTREME PRESSURE
LUBRICANTS ARE USED.
BRASS FITTINGS AND ADAPTERS - 65% OF THE TORQUE VALUE FOR STEEL.
TORQUE IS SPECIFIED IN FOOT POUNDS.
AEROQUIP BRAND FITTINGS
Dash
Size 37 Degree JIC O-Ring (ORS) O-Ring Boss (ORB)
-4 11-12 10-12 14-16
-5 15-16 — 18-20
-6 18-20 18-20 24-26
-8 38-42 32-35 50-60
-10 57-62 46-50 72-80
-12 79-87 65-70 125-135
-14 — — 160-180
-16 108-113 92-100 200-220
-20 127-133 125-140 210-280
-24 158-167 150-165 270-360
Table 2-2 Hydraulic Fitting Torque Specifications

3OPERATING INSTRUCTIONS
3-1 GENERAL
This section supplies information for operation
of the semitrailer. It describes and locates controls
and gives general operation procedures. Read all
instructions, warnings, cautions, and danger notes
before attempting to operate the semitrailer. Op-
erators must have proper training before operating
the semitrailer. (See Figure 3-1 for location of
semitrailer parts.)
WARNING
DO NOT OPERATE THE SEMITRAILER
WITH ANY KNOWN FAULT THAT
MIGHT ENDANGER THE OCCUPANTS,
NEARBY WORKERS, OTHER TRAFFIC,
THE LOAD, OR THE EQUIPMENT.
WARNING
DO NOT OPERATE THE SEMITRAILER
UNTIL YOU HAVE READ THE OPERA-
TOR’S MANUAL AND COMPLETELY
UNDERSTAND THE PROPER USE AND
FUNCTION OF ALL CONTROLS. IM-
PROPER USE CAN CAUSE PERSONAL
INJURY, DAMAGE TO YOUR SEMI-
TRAILER AND CARGO, AND CAUSE
TIME-CONSUMING BREAKDOWNS.
3-1.1 Parking Brake
The parking brakes are automatically applied
by spring pressure with the air actuators of the
braking system when air pressure in the emer-
gency line drops below 50 psi. This may be done
within the truck using the trailer parking/emergency
valve or by disconnecting the emergency glad-
hands.
3-1.2 Air Brake System
The air brake system of the semitrailer is oper-
ated from the towing vehicle after coupling. The
towing vehicle’s air system must be coupled to the
semitrailer and charged to 90 psi minimum before
the brakes can adequately function.
3-1.3 Anti-Lock Brake System (ABS)
The Anti-Lock Brake System of the semitrailer
is constant powered by the auxiliary (blue) circuit
of the seven way electrical connector, with backup
power from the stop lamp (red) circuit, and ground
through the white wire. It is necessary that the blue
circuit is hot when the tractor key switch is on. The
blue circuit on the trailer may not be used to power
any additional auxiliary devices while the semi-
trailer is moving forward. If a fault exists in the
ABS, normal braking will occur, but the wheels
may lock. Service the ABS as soon as possible.
CAUTION
THE AUXILIARY (BLUE) CIRCUIT IS
FOR POWERING THE SEMITRAILER
ABS. THIS CIRCUIT MUST BE HOT
WHEN THE TRACTOR KEY SWITCH IS
ON. NO OTHER ELECTRICAL DEVICES
MAY BE POWERED BY THIS CIRCUIT
WHILE THE SEMITRAILER IS MOVING
FORWARD.
CAUTION
IF A FAULT EXISTS IN THE SEMI-
TRAILER ABS, NORMAL BRAKING
WILL OCCUR, BUT WHEELS MAY
LOCK. SERVICE THE ABS AS SOON
AS POSSIBLE.
3-1

3-2
TRAILER BED
LOAD BLOCKS
HYDRAULIC ENGINE
SYSTEM
ENGINE AND
HYDRAULIC
CONTROLS
GOOSENECK
LIFT ARM
KINGPIN
GOOSENECK
LOAD PIN
LOAD PLATE
OUTRIGGER
D-RING
GOOSENECK LOCK HANDLE
LOAD BLOCK TRIP HANDLE
APPROACH PLATE
ELECTRICAL AND AIR
STORAGE COMPARTMENT
REAR BUMPER
ABS BLINK CODE
DIAGNOSTIC TOOL
REAR FLAG
HOLDER
ABS LIGHT
AIR RAISE/LOWER (OPT.)
SCALE-O-MATIC (OPT.)
trailer terminology
Figure 3-1 Models 325/326/327/329C Trailer Terminology
EMERGENCY AIR
GLADHAND
7 WAY ELECTRICAL
RECEPTACLE
HYDRAULIC HOOKUPS
3/4 QUICK COUPLERS
PRESSURE SIDE
RETURN SIDE
SERVICE AIR
GLADHAND
545-108665
Figure 3-2 Service Hookups

3-1.4 Electrical
The only electrical operation required of the
operator is interconnection of the towing vehicle
electrical cable plug with the semitrailer electrical
receptacle.
It is necessary that the tractor blue wire be
connected to the appropriate electrical source on
the tractor.
3-1.5 Hydraulic
Controls are located on the driver’s side of the
trailer. A hydraulic pump must be coupled to the
trailer hydraulic system before any hydraulic con-
trols can function. The hydraulic system is de-
signed to operate at 2500 psi maximum pressure
and approximately 17 gpm flow capacity.
3-2 PRE-COUPLING OF SEMITRAILER AND TRACTOR
3-2.1 Slowly back the tractor/truck (towing ve-
hicle) up to the front end of the semitrailer so
the kingpin of the gooseneck is centered be-
tween the tractor fifth wheel jaws. Stop the
towing vehicle just inches ahead of the semi-
trailer. Set tractor parking brake.
3-2.2 Check the gooseneck king pin plate
height. It should be in a horizontal position.
The king pin platform should be the same
height, to slightly lower, than the latch area
of the fifth wheel plate of the towing vehicle.
If necessary, connect the tractor hydraulic
lines, or start the semitrailer hydraulic power
engine. Use the TRAILER LIFT lever (See
Section 3-12) to raise or lower the kingpin
plate sufficiently to set proper coupling
height. Drain all air and moisture from the
towing vehicle air brake system following
towing vehicle manufacturer’s instructions.
3-2.3 Before pre-coupling the tractor to the
semitrailer, drain all air from the air brake
system by opening the drain cocks on the
reservoirs. Watch for excessive oil or water
buildup. Allow full air buildup in towing vehi-
cles air system.
3-2.4 Connect the service and emergency air
hoses of the towing vehicle to their respec-
tive gladhand on the front of the semitrailer;
red emergency line to the gladhand with the
“EMERGENCY” tag, and the blue service
line to the gladhand with the “SERVICE” tag
(See Figure 3-2). Chock the semitrailer
wheels before activating the semitrailer air
supply valve in the towing vehicle. Set the
parking brakes.
WARNING
FAILURE TO CHOCK SEMITRAILER
WHEELS COULD ALLOW MOVEMENT
OF THE SEMITRAILER RESULTING IN
SERIOUS PERSONAL INJURY, DEATH,
OR DAMAGE TO PROPERTY IN ITS
PATH.
3-2.5 Check the air brake operations of the
semitrailer as follows:
a. Apply brakes and inspect brake action on all
wheels for prompt application.
b. Release brakes. All brakes should release
immediately. Air pressure should discharge
quickly from the relay emergency valve.
c. Disconnect the emergency air line from the
semitrailer gladhand. Trailer brakes should
promptly set.
d. Re-connect the emergency air line to the
semitrailer and activate the semitrailer air
supply valve. The semitrailer brakes should
set.
3-3

3-3 COUPLING OF THE TRACTOR TO THE SEMITRAILER
DANGER
KEEP ALL PERSONNEL CLEAR OF
FRONT, REAR, AND SIDES OF TOW-
ING VEHICLE AND SEMITRAILER DUR-
ING COUPLING, COMPONENT OPERA-
TIONS, AND UNCOUPLING. FAILURE
TO STAY CLEAR CAN RESULT IN SE-
RIOUS PERSONAL INJURY OR DEATH.
3-3.1 Verify the semitrailer wheels are
chocked and brakes function properly.
3-3.2 Make certain the coupler of the towing
vehicle’s fifth wheel is open by pulling the
latch handle.
3-3.3 Slowly back the towing vehicle so its
fifth wheel contacts the front of the king pin
plate on the semitrailer and slips under it.
Continue backing until the fifth wheel coupler
locks onto the semitrailer kingpin.
3-3.4 Verify the vehicle coupling is secure by
attempting to pull the tractor forward a few
inches. If the tractor disconnects from the
semitrailer, locate source of coupling failure;
repair before continuing; and repeat Section
3-3.3 and 3-3.4.
3-3.5 Check that the towing vehicle couples
securely to the semitrailer before setting tow-
ing vehicle and semitrailer parking brakes.
IMPORTANT
KEEP BRAKES ENGAGED FOR REMAINDER
OF HOOKUP, CHECKOUT PROCEDURES, AND
PARKING.
3-4 CONNECTING TRACTOR SERVICES TO THE SEMITRAILER
3-4.1 Connect the towing vehicle 7-pole elec-
trical plug to the electrical receptacle on the
front of the semitrailer (See Figure 3-2).
IMPORTANT
THE KEY ON THE PLUG AND THE KEYWAY IN
THE SOCKET MUST BE PROPERLY ALIGNED
BEFORE INSERTING THE PLUG INTO THE
SEMITRAILER SOCKET.
CAUTION
HYDRAULIC OPERATING PRESSURES
GREATER THAN 2500 PSI CAN CAUSE
DAMAGE TO THE TRAILER.
3-4.2 If you have not already done so, con-
nect the tractor hydraulic lines to the semi-
trailer.
IMPORTANT
SOME OIL MAY NEED TO BE REMOVED FROM
THE TRACTOR RESERVOIR TO ALLOW ROOM
FOR 5.5 GALLONS OF ADDITIONAL OIL DIS-
PLACED FROM THE TRAILER HYDRAULIC
SYSTEM.
3-4.3 Air Lines: See Section 3-2.
3-4

3-5 TRACTOR AND SEMITRAILER CHECK-OUT
WARNING
FAILURE TO PROPERLY SET AND
CHECK PARKING BRAKE, AND
CHOCK WHEELS WHEN PARKING
AND DURING STORAGE, COULD AL-
LOW MOVEMENT OF THE
TRUCK/SEMITRAILER RIG RESULT-
ING IN SERIOUS PERSONAL INJURY,
DEATH, OR DAMAGE TO PROPERTY
IN ITS PATH.
CAUTION
FAILURE TO SUPPORT THE SEMI-
TRAILER FULLY ON THE LOAD
BLOCKS DURING TRANSPORT, MAY
RESULT IN DAMAGE TO THE LOAD,
THE SEMITRAILER, AND POSSIBLE
SERIOUS INJURY OR DEATH TO INDI-
VIDUALS NEAR THE SEMITRAILER.
3-5.1 Activate the hydraulic power source.
3-5.2 Be sure the GOOSENECK LIFTARM
(See Section 3-9) is in the "UP" position.
3-5.3 Using the TRAILER LIFT lever (See
Section 3-12), lift the trailer up until the load
blocks can be lowered into position (See
Figure 3-1).
3-5.4 Using the LOAD BLOCK TRIP LEVER
(See Section 3-10), lower the load blocks to
the transport position.
3-5.5 Activate the TRAILER LIFT lever (See
Section 3-12) “DOWN” until the semitrailer
rests completely on the load blocks (See
Figure 3-1).
3-5.6 Check the operation of all lights and sig-
nals on the semitrailer for proper response to
switch positions (stop, right turn, left turn,
and clearance). Check operation of remote
function if present.
3-5.7 Check tire inflation, adjust as needed to
the pressure listed on the semitrailer VIN
plate, located on the front of the semitrailer.
3-5.8 Check tractor/semitrailer for air leaks. If
air leakage is found, repair the defect before
transporting.
3-5.9 Check the oil in each hub for proper
level and freedom from contamination. If
hubs are contaminated with water, dirt or
some other foreign material, clean before
transporting.
3-5.10 Check tractor air pressure. Pressure
must not fall below 90 psi, even after activat-
ing brakes a couple of times. Set parking
brake and carefully remove all wheel chocks.
Set emergency brake and try pulling forward.
The semitrailer wheels must not rotate. If
semitrailer brakes do not apply, DO NOT
transport until defect, or defects, are re-
paired.
3-5

3-6
PULL TO RELEASE
THROTTLE KEY SWITCH
OFF ON
START
LL
PULL TO RELEASE
OFF ON
START
LANDOLL
hydr controls
GOOSENECK LIFTARM
LEVER
TRAILER LIFT LEVER
GOOSENECK LOCK
HANDLE
LOAD BLOCK
TRIP HANDLE
Figure 3-3 Hydraulic Controls

3-6 TOWING THE SEMITRAILER
Driving the towing vehicle with the semitrailer
coupled behind requires constant attention to the
overall length of the combination. The “hinged-in-
the-middle” configuration of the tractor and semi-
trailer, load, and weight effect performance. Turn-
ing, passing, acceleration, braking, stopping, and
backup require special considerations. When exe-
cuting steep grades or turning tight curves, the
semitrailer must not be allowed to push the towing
vehicle, or jack knifing the semitrailer with the tow-
ing vehicle may result. Application of the semitrailer
brakes to keep the semitrailer in tow will help pre-
vent this pushing. Braking should begin before de-
scending a hill or attempting a curve, to assure
control.
CAUTION
WHEN OPERATING SEMITRAILER, DO
NOT BACK OVER CURB. THIS WILL
CAUSE SEVERE DAMAGE TO UNDER-
CARRIAGE.
3-6.1 Make a moving test of the semitrailer
brakes at low, and medium speeds before
traveling at highway speed.
a. The Anti-Lock Brake System (ABS) warning
lamp mounted at left rear side of the semi-
trailer should come on when power is sup-
plied to the ABS by turning the tractor
keyswitch on. The warning lamp should go off
once the semitrailer exceeds 4 mph. If the
warning lamp does not go off, a fault exists in
the semitrailer ABS. Once the vehicle speed
exceeds 4 mph, the light should remain off
unless a fault occurs or the keyswitch is
turned off, then on again.
CAUTION
IF A FAULT EXISTS IN THE SEMI-
TRAILER ABS, NORMAL BRAKING
WILL OCCUR, BUT WHEELS MAY
LOCK. SERVICE THE ABS AS SOON
AS POSSIBLE.
3-6.2 Monitor the air pressure gauge on the
dash of the towing vehicle. Pressure should
not fall below 90 psi at any time.
3-6.3 The semitrailer wheels track to the in-
side of the towing vehicle during turns. Thus,
turning corners requires a wide swing to pre-
vent “curb hopping”, and to allow the semi-
trailer wheels to clear any obstacle on the in-
side of the corner.
3-6.4 To stop, use a gradual and smooth ap-
plication of brakes. If grabbing occurs, apply
less pressure - grabbing brakes are not effi-
cient.
WARNING
ALWAYS CHECK BEHIND AND UNDER
THE TRUCK AND SEMITRAILER FOR
PERSONS OR OBJECTS BEFORE
MOVING. FAILURE TO CHECK CAN
LEAD TO SERIOUS PERSONAL IN-
JURY OR DEATH TO OTHERS, OR
DAMAGE TO PROPERTY.
3-6.5 Backing should be done with care. Tail
overhang, semitrailer length, and allowable
space must be taken into consideration when
backing the semitrailer.
3-7

3-7 PARKING THE TRAILER
3-7.1 Position truck/semitrailer rig on a level,
solid surface.
3-7.2 Set the PARKING BRAKE,not the
semitrailer hand brake, and check for proper
brake holding.
3-7.3 Chock wheels of semitrailer.
3-7.4 Check for any air leaks in lines, relay
valve, brake pods, or any other air system
component.
WARNING
WHEN LEAVING THE SEMITRAILER
UNATTENDED, POSITION ALL HY-
DRAULIC CONTROLS TO THE NEU-
TRAL OR “OFF” POSITION OR DIS-
CONNECT THE TRACTOR HYDRAULIC
HOOK-UP.
3-8 UNCOUPLING TOWING VEHICLE FROM SEMITRAILER
3-8.1 Park the semitrailer according to instruc-
tions in Section 3-7.
3-8.2 Using the TRAILER LIFT LEVER (See
Section 3-11), raise the semitrailer until the
load blocks can be raised.
3-8.3 Using the LOAD BLOCK TRIP LEVER
(See Section 3-10), raise the load blocks up
into the gooseneck.
3-8.4 Using the TRAILER LIFT LEVER (See
Section 3-11, lower the semitrailer until the
semitrailer rests on the ground.
3-8.5 Shut off the hydraulic pump.
3-8.6 Disconnect the emergency and service
air lines and attach them to the tractor glad-
hand holders. If present, install dummy glad-
hands on trailer couplings.
3-8.7 Disconnect the 7-pole cable and hydrau-
lic lines from the semitrailer and store with
the tractor.
3-8.8 Pull the tractor fifth wheel plate latch re-
lease lever.
3-8.9 Attempt to pull the tractor forward. If the
tractor uncouples, verify all service lines are
disconnected and semitrailer wheels are
chocked. If tractor does not disconnect, re-
peat Section 3-8.8 and 3-8.9.
3-8.10 Pull the tractor away from the semi-
trailer.
DANGER
ALWAYS CHECK BEHIND AND UNDER
THE TRUCK AND SEMITRAILER FOR
PERSONS OR OBJECTS BEFORE
MOVING. FAILURE TO CHECK CAN
LEAD TO SERIOUS PERSONAL IN-
JURY OR DEATH TO OTHERS, OR
DAMAGE TO PROPERTY.
3-9 GOOSENECK LIFTARM LEVER
The GOOSENECK LIFTARM lever (See Fig-
ure 3-3) is located on the driver's side of the
gooseneck assembly. It is the left or front most le-
ver. The lever has three positions:
UP This position raises the gooseneck
lift arm to the transport or hook-up
position.
CENTERED This is the neutral position. This po-
sition will not operate any of the
semitrailer components.
DOWN This position lowers the gooseneck
lift arm, permitting the transport of
the detached gooseneck.
3-8