Manhole………………………………………………………..Check clamping device for proper
cover closure and check gasket for damage
Front and Rear Structure Bolts………………………………….…Check for proper torque

MONTHLY
Manhole……………………………………………………………...Clean manhole and oil clamps
General Inspection………………………………………..Perform inspection (see page 51)
Supports………………………………Lubricate; check mounting bolts for proper torque
Axle Camshafts………………………………………………………..Lubricate all grease fittings
90 DAYS
Relief Valve………………………………….Remove and inspect relief valve for clogs of
hardened material. Bench test relief valve to ensure proper operation.

52

EVERY 5000 MILES
King Pin Alignment……………………………………………………Check for proper alignment
Brakes………………………………………………………………………..…….………Adjust as needed
Wiring………………………….............Check for chafed or broken wires, ground wire
Connections, loose wire retaining clips and dielectric grease.
Upper 5th Wheel…………………………………………………………………..………………..Lubricate
Suspension…………………………………….……………………...Check for proper bolt torque
Piping………………………………….………Check all piping supports-tighten if necessary
Aeration……………………………………Check all aeration tee bolts - hand tighten only

EVERY 10,000 TO 25,000 MILES
Wheel Bearings……………………………...……….Verify proper end play and adjust as
necessary
Brakes………………………………………………..Inspect linings, free-up brake shoes and
anchor pins
EVERY TWO YEARS
Aeration…………….…………………………….Inspect and replace aeration components
as necessary. At a minimum, trailers in abrasive product service should be
inspected every six months.

53

Lubrication and Service Chart
X

Drain any water from air reservoirs

X

Check manhole clamps, cover closures and gaskets

X

Clean manhole and lubricate its clamps
X

Check the operation of all lights

X

Check all wiring connections

X

Check for broken or chafed wires
X

Check brake operation

X

Adjust brakes (Pg. 58)
Inspect slack adjusters, brake linings and brake chambers

X

Free up brake shoes and anchor pins (Pg. 58)

X
X

Check condition of walkways and toe rails

X

Check suspension bolt torque (Pg. 79)
X

Check tires for damage and wear (Pg. 69)

X

Check axle alignment to king pin (Pg. 71)
Check lubricant level and oil seals on the axles (Pg. 66)

X

Check ladder bolt tightness

X

Check the operation of pressure relief device (Pg. 52)

X

Inspect aeration system (Pg. 56)

X
X

Lubricate grease fittings on axle camshafts

X

Check wheel bearings (Pg. 66)

X

Check lug nut torque (Pg. 70)
Check piping supports and mounting fastener tightness

X

Check front and rear structure fastener tightness

X

Check all valves, piping and manholes for leakage

X
X

Check landing gear mounting fastener tightness
X

Check upper coupler fastener torque

X

Check king pin wear
Lubricate upper coupler plate and king pin

X

Visually check tightness of all fasteners

X
X

Check all supports and braces

Annually

5,000 Miles

Monthly

Daily

54

Weekly

Tank trailer should be inspected periodically to ensure it meets D.O.T.
requirements.
Refer to the D.O.T. Transportation of Hazardous Materials Handbook
(paragraph 177.824) if hazardous materials at to be hauled.

10K-25K Miles

Notice

LUBRICATION & SERVICE
1. Manhole Cover-(Weekly)-check clamping device for proper cover closure;
check gasket for damage. (Monthly)-Clean manhole gasket and lubricate
clamps.
2. Lights and Wiring-(Daily)-check all lights for proper operation. (Weekly)Check all connections. (Every 5000 miles)-Check for chafed or broken wires.
3. Anti-Lock Brake System-(Daily)-Check for proper operation. Refer to AntiLock System Maintenance Manual. (Every 5000 miles)-Adjust brakes, see
page 58. (Every 10,000 to 25,000 miles)-Inspect linings, free-up brake
shoes and anchor pins.
4. Rear Structure-(Weekly)-Check bolts for proper torque (150 ft-lbs)
5. Suspension-(Every 5000 miles)-Check for proper bolt torque. See page 79
for torque chart.
6. Tires-(Daily)-Check for proper inflation, cuts or other damage. See Page 69.
7.

Axles-(Weekly)-Check oil level and for leakage around oil seals, see page
66. Recommended hub oil is Synthetic 75W-90. Recommended hub grease
is Mobilith 007 and Chevron Delo. Check pivot bolt connections for proper
torque. (Every 5000 miles) Check axle alignment to king pin, see page 71.
Do not mix oil with grease.

8. Wheels-(Weekly)-Check lug nuts or bolts for proper torque, see page 70.
(Every 10,000 to 25,000 miles) Check wheel bearings. Tighten or replace as
required. See page 67.
9. Aeration -Clean or replace as required. (Every 2 years)
10. Piping-Check for loose clamps, damaged hoses or leaks. (Monthly) Perform
general inspection.

11. Supports-(Monthly)-Lubricate; check mounting bolts for proper torque (150
ft-lbs).
12. Front Structure-(Weekly)-Check bolts for proper torque (150 ft-lbs).
13. Landing Gear - (At least every 3 months) - Lithium Base 1-2% Moly EP-2.
For temperatures less than –50 use Artic-Grade all weather white grease.
14. Upper 5th Wheel-(Every 5000 miles) Lubricate with multipurpose synthetic
grease.
15. Compressor or Blower-Service according to manufacturer’s recommendations.

55

GENERAL INSPECTION-AERATION SYSTEM
The following inspection should be performed monthly.
1. Check pressure gauges for accuracy.
2. Close manhole covers. Close all valves except aeration valves. Remove
dust cap from product line.
3. Start compressor (or blower) and pressurize tank until relief valve opens.
DO NOT EXCEED MAXIMUM OPERATING PRESSURE.
4. After tank is pressurized, close the aeration valves and shut off compressor blower. Tank pressure should remain relatively constant. If pressure
drops excessively, check for leaks in manhole cover, relief valve, blowdown valve and tank proper. If none are found with the above inspection,
check for air leaks in the aeration, pressure control and product valves.

WARNING
If relief valve does not open at pressure specified on valve, shut off
compressor or blower and correct the cause of the inoperative relief
valve. See page 52 for testing Relief Valve.

NOTICE
Compressors can be severely damaged if operated at speeds and
pressures higher than rated and if the air filter is clogged. Check
operating speed and pressure rating of the compressor to make sure
it is not running too high. See Manufacturer’s recommendations.

56

5. When inspection is complete, open blow-down valve to exhaust the

air in the tank. Replace dust cap on product line. If one or more
hoppers does not discharge properly, and there are no leaks in tank
or valves, the following service procedure is recommended.
1. Remove product from these sections.
2. Check aeration line for possible plug.
3. Check aeration device on interior of tank. Look for torn
molded neoprene cone(s), rotated wear plate(s) or plugged
aerator housings (see Figure 10). Replace as necessary.

Figure 10. Exploded View of Aerator

57

BRAKES-MAINTENANCE & ADJUSTMENT
NOTICE
For more information reference the manufactures web literature or call their
customer support.

The wheel brakes are equipped with slack adjusters for easy brake
adjustment to compensate for brake lining wear. It is recommended
that slack adjuster arm travel be held to a minimum for most efficient
braking action. The brakes should be adjusted when total arm travel
reaches 1-1/2”.
To adjust brakes, depress lock sleeve on slack adjuster, then turn
adjustment screw as required. Make sure lock sleeve returns to lock
position when adjustment is complete.
Every 5000 miles, the brake camshafts should be lubricated with
approved chassis lubricant. Every 10,000 to 25,000 miles, the brakes
should be serviced as follows:
1. Remove wheels and hubs.
2. Inspect brake roller shafts, cam rollers, anchor pins, camshaft support bushings, spider bushings and camshaft for
wear and replace if necessary. Lubricate these parts with
chassis lubricant upon reassembly.
3. Inspect brake linings for wear, loose rivets and any signs of
grease on the braking surface. Oil-soaked linings are not
reusable and must be replaced. Check to ensure that the
linings have not worn to the point that rivet heads are
contacting inside surface of drum. Reline or replace brake
shoes if necessary.
4. Check inside surface of drum. Rebooting of drums is not
recommended, as the strength of refaced drums is greatly
reduced. If drum is worn, replace it.
5. Service the wheel bearings and seals if required.
Reassemble hubs and wheels.

58

DISC BRAKE INSPECTION & PREVENTIVE MAINTENANCE
Basic Inspection w/ wheel mounted
1. For vehicles with electronic wear indicators, use the dash indicator(s) and/
or the hand-held diagnostic tool to regularly monitor the pad wear.
2. In all cases, visually inspect the wear indicator every three months (or
keep track of the results of maintenance inspections to schedule checks 4 to 5
times during the pad lifetime). If indicators line up time to schedule inspection of pads and rotors.
3.

A visual check of the mechanical wear indicator every time the tire
pressures are checked is recommended. Be alert for any rotor cracks, etc.
visible.

4. Follow all industry safety guidelines. On level ground, with the wheels
chocked and the parking brake temporarily released, check for movement
of the brake caliper. This small movement, less than 0.80" (2 mm) approximately the thickness of a nickel - in the inboard/outboard direction
indicates that the brake is moving properly on its guide pins. If the caliper
has no movement or appears to move greater than the distances above, a
full wheel-removed inspection will be necessary

.

Basic Inspection w/ wheel removed (annually and at pad replacement)

1.

Inspect the rotor for cracks, etc.

2.

Inspect the running clearance and adjuster function.

3.

Inspect the caliper travel.

4.

Inspect the tappet and boot assemblies.

5.

Inspect all covers, caps, hoses and brake exterior for damage etc.

Figure 11. Pad Indicators
59

ROLLOVER PROTECTION AND ABS
INTRODUCTION

The rollover protection available on Heil trailers is an electronic, selfmonitoring system that works with standard air brakes to enhance the safety
and reduce the potential of trailer rollover accidents. Electronic rollover
protection systems monitor many factors that may cause a rollover accident;
vehicles speed, wheel speed, air suspension pressure, and lateral acceleration along the vehicles roll axis. Rollover protection activates when one or
more factors exceed safe conditions. The trailers stability is achieved by the
rollover device sensing unsafe conditions or speeds and sending a signal to
the Electronic Control Unit (ECU), where it reduces the vehicles speed to a
“safe” range. All data may be looked up from the information centers or by
hooking up a diagnostics tool.

DANGER

IT IS IMPORTANT TO NOTE THAT THE TRAILERS “ROLL STABILITY SYSTEM” IS MERELY
A LIMITED ASSIST TO MINIMIZE ROLLOVERS UNDER CERTAIN SITUATIONS AND IS
NOT INTENDED TO NOR WILL IT PREVENT ROLLOVERS IN ALL SITUATIONS, AND
MORE PARTICULARLY, THOSE RESULTING FROM DRIVER ERROR OR INSUFFICIENT
TRAINING OR EXPERIENCE, IMPROPER TRAILER CONDITION AND LOADING, EXCESSIVE SPEED FOR CONDITIONS, ROAD DESIGN INCLUDING EXITS, ROAD DEBRI AND
HAZARDS SUCH AS OTHER VEHICLE ACCIDENTS, WEATHER CONDITIONS, IMPROPER
ABS, BRAKE COMPONENT AND WHEEL MAINTENANCE, IMPROPER TIRE CONDITION
AND REPLACEMENTS AND OTHER CONDITIONS WITHIN OPERATOR CONTROL AND
OBSERVATION FOR ASSESSING POTENTIAL ROLLOVER CONDITIONS AND HAZARDS
WHICH COULD POSSIBLY LEAD UP TO A POTENTIAL ROLLOVER RESULTING IN,
PERSONAL INJURIES, FATALITIES AND ENVIRONMENTAL AND PROPERTY DAMAGE.

INSTALLATION
Refer to CD supplied with tank for installation diagrams, procedures and
plumbing schematics. These drawings are trailer specific.

Common Types of Trailer Rollover Protection and ABS

>Haldex. Trailer Roll Stability (TRS)
>Meritor WABCO. RSSplus Trailer ABS with Roll Stability
>Bendix. Bendix ABS with ESP (Electronic Stability System)
60

ROLLOVER PROTECTION AND ABS
NOTICE
Remove all air pressure and electrical power from the brake system
before beginning any work on system.

DIAGNOSTICS/TROUBLESHOOTING
Most ABS or Roll Stability problems are related to:
1. Cut, corroded, or abraded wires.
2. Corroded connectors and terminals.
3. Connector terminal not latched or seated correctly to mating assemblies.
4. Excessive sensor air gap, sensor clip retention.
5. Wheel bearing end play.

Faults, problems and diagnostics are displayed two different ways. When the
system detects an issue it alerts the driver/owner by either delivering a Blink
Code Count to the ABS indicator lamp located on the rear streetside fender
(Figure 13) or by sending a fault code to an information center (Figure 12)
located on the rear frame of the trailer.

Figure 13. ABS indicator Lamp

Figure 12. TRS Info Center 2

Note. Data collected when the system detects a fault will be stored and can
be retained with proper diagnostic tool.

61

ROLLOVER PROTECTION AND ABS
DIAGNOSTICS/TROUBLESHOOTING

Diagnostic Trouble Fault Codes List (HALDEX)

Power Supply Fault Code List
ECU TIME OUT or NO LINK

No supply on ignition switched line. Check truck fuses, 7-way
connection, 5-way ABS connection, power cable connections.
Check diagnostic cable for corrosion.

PWR ISO7638 FAILI

Intermittent power loss. Check all electrical connections as
mentioned above.

PWR LO VOLT

Supply voltage < 8 volts. Check voltage regulator on tractor,
loose connections, and corrosion.

PWR HI VOLT

Supply voltage > 17 volts. Same as above.

Sensor/Sensor Extension Fault Code List
Note. The fault code identified which sensor/wheel end needs
to be checked.
S1A
S1B
S2A
S2B

CONT
CONT
CONT
CONT

Open or Short Circuit. 1. Disconnect the sensor extension
cable from sensor and measure electrical resistance between
the two pins in the sensor housing, it should be between 9802350 ohms. 2. Disconnect sensor extension from ECU and
measure continuity.

S1A
S1B
S2A
S2B

SIGNAL
SIGNAL
SIGNAL
SIGNAL

Intermittent low sensor output occurs when vehicle is moving.
Check for broken sensor retaining clip, damaged or misaligned
exciter ring, excessive wheel bearing end play, loose/ damaged/corroded sensor connections or a break inside the sensor cabling.

62

ROLLOVER PROTECTION AND ABS

DIAGNOSTICS/TROUBLESHOOTING
Sensor/Sensor Extension Fault Code List (cont..)
S1A
S1B
S2A
S2B

SIGNAL
SIGNAL
SIGNAL
SIGNAL

Low sensor output. 1. Rotate the wheel at 1 rev / 2 sec and
measure AC voltage at the sensor plug, it should be > 200
millivolts. 2. Make sure sensors are pushed up against exciter rings.

Modulators Fault Code List
BRK APPLY SC
BRK APPLY OC
BRK APPLY SC DRIVE BRK
APPLY UNSPEC

Internal fault with the brake apply solenoid. Detach ECU
and replace modulator.

EPRV 21 HOLD SC
EPRV 21 DUMP SC
EPRV 21 HOLD OC
EPRV 21 DUMP OC
EPRV 21 HOLD SC DRIVE
EPRV 21 DUMP SC DRIVE
EPRV 21 HOLD UNSPEC EPRV
21 DUMP UNSPEC

Internal fault with the hold or dump solenoids of modulator
21. Detach ECU and replace modulator.

EPRV 22 HOLD SC
EPRV 22 DUMP SC
EPRV 22 HOLD OC
EPRV 22 DUMP OC
EPRV 22 HOLD SC DRIVE
EPRV 22 DUMP SC DRIVE
EPRV 22 HOLD UNSPEC EPRV
22 DUMP UNSPEC

Internal fault with the hold or dump solenoids of modulator
22. Detach ECU and replace modulator.

DEMAND SC
DEMAND OC

Internal fault with the service/control line pressure transducer. Detach ECU and replace modulator.

EPRV
EPRV
EPRV
EPRV

21
21
22
22

DEL
DEL
DEL
DEL

SC
OC
SC
OC

Internal fault with the delivery pressure transducer. Detach
ECU and replace modulator.

63

ROLLOVER PROTECTION AND ABS

DIAGNOSTICS/TROUBLESHOOTING
Modulators Fault Code List (cont..)
EPRV 21 SLOW REC
EPRV 22 SLOW REC

Wheels are slow to recover after brakes are released. Make
sure foundation brakes are operating properly, delivery hoses
not pinched, speed sensors not crossed with modulator,
correct side-by-side plumbing.

RESR SC
RESR OC

Internal fault with the reservoir pressure transducer. Detach
ECU and replace modulator.

SUSP SC
SUSP OC
SUSP OUT OF RANGE

1. Check for air leaks on suspension lines 2. Make sure leveling valve is plumbed correctly 3. Internal fault with the suspension pressure transducer. Detach ECU and replace modulator.

WARNING
The Roll Stability and ABS is an electrical system. When you work on
the ABS, take the same precautions that you must take with any electrical system to avoid serious personal injury. As with any electrical
system, the danger of electrical shock or sparks exists that can ignite
flammable substances. You must always disconnect the battery
ground cable before working on the electrical system.