automatic transmission CHEVROLET LOW CAB FORWARD 2019 Owner's Guide

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
Driving and Operating 237
and other systems, resulting in a
vehicle breakdown or in a
malfunction of electronic equipment.
Consult your dealer if you wish to
install radio equipment.
Power Take-Off (PTO)
If equipped, the PTO is a device
that is used to provide engine power
to special equipment directly from
the engine or through the
transmission. For details about the
PTO operation, refer to the separate
instruction manual provided by its
maker.
If the optional PTO function is used
for long periods of time, make sure
to regularly check the diesel
particulate filter (DPF) indicator.
Automatic DPF regeneration will not
take place while the PTO function is
active.
1. Engine Speed ControlSwitch
2. Main Switch
{Warning
In PTO mode, Cruise Set/Resume
Switch can be used exactly the
same as PTO Engine Speed
Control Switch. Improper
operation of these switches may
cause personal injury or damage.
When Operating the PTO
For operation of special equipment,
see the manufacturer ’s instructions.Installations, or alterations to the
original equipment vehicle or
chassis, as manufactured and
assembled by General Motors, are
not covered by this warranty. The
body company, assembler,
or equipment installer is solely
responsible for warranties on the
body or equipment and any
alterations to any of the parts,
components, systems,
or assemblies installed by GM.
Examples include, but are not
limited to, special body installation,
such as recreational vehicles, the
installation of any non-GM part,
cutting, welding, or the
disconnecting of original equipment
vehicle or chassis parts and
components, extension of the
wheelbase, suspension, and
driveline modifications, and axle
additions.
The engine control module (ECM)
has the ability to accommodate one
of three different PTO modes. Each
mode can be programmed to
accommodate many PTO devices.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
Vehicle Care 239
Vehicle Care
General Information
General Information . . . . . . . . . . 240
California Proposition65 Warning . . . . . . . . . . . . . . . . . 240
California Perchlorate Materials Requirements . . . . . 240
Accessories and Modifications . . . . . . . . . . . . . . . . 240
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 241
Cab Tilting . . . . . . . . . . . . . . . . . . . . 243
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . 244
Engine Cover . . . . . . . . . . . . . . . . . 245
Engine Oil . . . . . . . . . . . . . . . . . . . . 245
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . . . 251
Engine Air Cleaner/Filter . . . . . . 253
Engine Coolant . . . . . . . . . . . . . . . 253
Engine Overheating . . . . . . . . . . 259
Power Steering Fluid . . . . . . . . . 262
Washer Fluid . . . . . . . . . . . . . . . . . 262
Brakes . . . . . . . . . . . . . . . . . . . . . . . 263
Brake Fluid . . . . . . . . . . . . . . . . . . . 268
Battery - North America . . . . . . 269 Fuel Filter . . . . . . . . . . . . . . . . . . . . 270
Rear Axle (Gear Oil Viscosity
Chart) . . . . . . . . . . . . . . . . . . . . . . . 271
Rear Axle (Oil Level Check) . . . . . . . . . . . . . . . . . . . . . . 272
Noise Control System . . . . . . . . 272
Automatic Transmission Shift Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . 274
Wiper Blade Replacement . . . . 275
Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 277
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 277
Headlamps and Front Turn Signal . . . . . . . . . . . . . . . . . . . . . . . 280
Roofmarker Lamps . . . . . . . . . . . 284
Sidemarker Lamps (Including Turn Signal and Cornering
Lamps) . . . . . . . . . . . . . . . . . . . . . . 284
Taillamps, Turn Signal, Stoplamps, and Back-Up
Lamps . . . . . . . . . . . . . . . . . . . . . . 286
License Plate Lamp . . . . . . . . . . 286
Interior Lamps . . . . . . . . . . . . . . . . 287
Electrical System
Electrical System Overload . . . 287
Wheels and Tires
Wheels and Tires . . . . . . . . . . . . . 295
Tire Pressure . . . . . . . . . . . . . . . . . 307
Tire Rotation . . . . . . . . . . . . . . . . . 307
If a Tire Goes Flat . . . . . . . . . . . . 310
Jump Starting
Jump Starting - North America . . . . . . . . . . . . . . . . . . . . . 311
Towing the Vehicle
Towing the Vehicle . . . . . . . . . . . 315
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . 317
Interior Care . . . . . . . . . . . . . . . . . . 323

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
Vehicle Care 251
or bodies of water. Instead, recycle
it by taking it to a used oil collection
facility which may be found in your
community.
Automatic Transmission
Fluid
{Warning
Overfilling of the automatic
transmission can cause the fluid
to be "PURGED" out of the
breather hose onto the hot engine
parts and can cause a fire.
You and others could be seriously
injured.
Both quality and quantity of fluid are
important factors that have a
significant influence on the
performance and durability of the
automatic transmission. Be sure to
use only the dealer recommended
fluid for replenishment, and observe
the specified fluid level. Too much or too little transmission
oil could damage your transmission.
Too much could cause your
transmission to overheat and fluid to
spill out from the breather hose. Be
sure to get an accurate reading if
you check your transmission fluid.
When cleaning around the dipstick
and guide tube, make sure that you
thoroughly wipe away all of the dirt
and dust etc. Failure to do so may
cause a fault in the transmission.
Do not let coolants (ethylene glycol
type), water based substances,
or other fluids etc., mix with the
fluid. Otherwise, degraded
performance and faulty operation of
the system will result.
Checking the Automatic
Transmission Oil level
This operation could be difficult and
you may choose to have this done
at your dealer.
If you choose to do it yourself, then
be sure to follow all the instructions
below or you could get a false
reading on the dipstick.Position of the Dipstick
For the single cab vehicle, the
dipstick is located to the left side of
the automatic transmission at the
rear of the engine. Tilt the cab up to
inspect it.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
252 Vehicle Care
For the crew cab vehicle, the
dipstick is located beneath the
rear-of-engine inspection panel.
After unlatching the A/T fluid
inspection cover, the dipstick will be
visible.
Inspection
Wait at least 30 minutes before
checking the transmission fluid if
you have been driving at high speed
for a long period of time, in city/
heavy traffic or while pulling a trailer.1. Start the engine, and drive the vehicle for approximately
10 minutes to warm up the
engine. During 10 minutes, the automatic transmission fluid
should reach a temperature of
approximately 70 - 80 °C (158 -
176 °F). During the winter
when temperatures are low,
adjust the amount of driving
time according to the actual
conditions.
2. Park the vehicle on level ground, and firmly apply the
parking brake.
3. With the engine idling, move the selector lever from the “P”
position to the “1”position
while pressing the brake pedal,
and then return the lever from
the “1”position to the “P”
position.
4. With the engine still idling, pull out the dipstick and wipe it with
a clean cloth.Transmission Dipstick
5. Reinsert the dipstick into position, pull out the dipstick
slowly, and check whether the
fluid level is within the “H”
marked range. Always check
the fluid level at least twice.
Consistently is important in
maintaining accuracy.
If inconsistent readings persist,
check the transmission
breather to ensure that it is
clean and free of debris.
. Dipstick C (COLD) —
Transmission fluid
temperature Approx. 20 -
30 °C (68 - 86 °F).

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
Vehicle Care 253
.Dipstick H (HOT) —
Transmission fluid
temperature Approx. 70 -
80 °C (158 - 176 °F).
. The “C (COLD)” range on
the dipstick is a guide used
by your dealer for
specialized equipment used
to replace or service the
automatic transmission
fluid. When performing your
own inspections, always
use the “H (HOT)” range
after warming up the
vehicle.
The fluid must be hot to
ensure an accurate check.
The fluid level rises as
temperature increases.
6. If the fluid level is too low, add the specified fluid through the
dipstick guide tube. Also, check
whether there are no fluid
leaks.
7. Insert the dipstick securely into position.{Warning
Be extremely careful not to burn
yourself when checking the oil
level if the engine temperature is
high. Protect yourself with
gloves etc.
You and others could be seriously
injured.
Discarded parts, oil, grease and
fluids could have an adverse effect
on the environment. It is difficult to
dispose of these, so have your
dealer handle all checks and
replacements.
Engine Air Cleaner/Filter
Air Cleaner
Using a clogged air cleaner element
not only reduces engine output but
also causes increased fuel
consumption and an increased DPF
regeneration frequency. Be sure to use a genuine air cleaner
element. If a different air cleaner
element is used, it may cause the
sensor to output a wrong signal.
See
Maintenance Schedule 0327.
Air Cleaner Indicator Light
When the air cleaner indicator light
comes on, check the air cleaner
element. If the air cleaner element is
clogged, replace the air cleaner
element.
See Vehicle Messages 086.
See Maintenance Schedule 0327.
Engine Coolant
Protection of Engine Against
Overcooling
Overcooling of the engine not only
accelerates wear of the vital engine
parts but also hurts fuel economy.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
274 Vehicle Care
Automatic Transmission
Shift Lock Control
Function Check
When the Selector Lever
Cannot be Moved From the "P"
Position
Perform the following when the
selector lever cannot be moved from
the "P" position.
Caution
When the selector cannot be
operated from the P position to
any other position even after
performing the operation below
repeatedly, the shift lock system
may have a failure. Have the
vehicle inspected at your dealer.
When performing the below
operations, make sure the parking
brake is securely engaged. 1. Securely pull the parking brake lever and stop the engine.
2. Remove the cup holder (1) byremoving the three Torx®
bolts (2).
3. Remove the selector levercover by removing the four
screws and lifting it up.
4. Operate the selector lever (1)
while pressing the release
lever (2).
When installing the cover, perform
the removal procedure in reverse
order.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
332 Service and Maintenance
No. Service Interval16 000 km/10,000 mi
24 000 km/15,000 mi
32 000 km/20,000 mi
48 000 km/30,000 mi
64 000 km/40,000 mi
72 000 km/45,000 mi
80 000 km/50,000 mi
96 000 km/60,000 mi
112 000 km/70,000 mi
120 000 km/75,000 mi
128 000 km/80,000 mi
144 000 km/90,000 mi
160 000 km/100,000 mi
168 000 km/105,000 mi
176 000 km/110,000 mi
Service intervals
months or
kilometers
(miles)
whichever
occurs first (1)
19 Brake drum and rotor for
wear and damage
- - I - I - - I - - I - I - I or every
12 months
20 Brake electric
vacuum pump I - I I I - I I I - I I I - I or every
12 months
21 Brake fluid I - I R I - I R I - I R I - I or every
12 months: I
or every
12 months: R
22 Hydraulic brake booster
(HBB) fluid (5500HD
5500XD models) - - - R - - - R - - - R - - -
or every
24 months
23 Brake line and hoses - - I - I - - I - - I - I - I or every
12 months
24 Parking brake cable I - I I I - I I I - I I I - I or every
12 months
25 Automatic transmission
fluid I - I R I - I R I - I R I - I
or every
12 months

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
338 Service and Maintenance
21. Brake Fluid :Check the fluid in
the brake fluid reservoir every
16 000 km (10,000 miles). Replace
the fluid every 48 000 km
(30,000 miles).
22. Hydraulic Brake Booster Fluid
(5500HD, 5500XD models) :
Replace Dexron VI ATF fluid every
24 months or 30,000 miles
(48,000 km), whichever occurs first.
23. Brake Line and Hoses : Check
lines and hoses for proper hook-up,
binding, leaks, cracks, chafing, etc.
every 32 000 km (20,000 miles).
Any questionable parts should be
replaced or repaired at once. When
rubbing or wear is noted on lines or
hoses, the cause must be corrected
at once.
24. Parking Brake Cable : Check
the parking brake cable every
16 000 km (10,000 miles) or
12 months whichever occurs first.
25. Automatic Transmission
Fluid : Check the automatic
transmission fluid level at each engine oil change and replace fluid
every 48 000 km (30,000 miles). Do
not overfill.
26. Differential Gear Oil :
Replace
lubricant every 48 000 km
(30,000 miles). Check lubricant level
every 16,000 km (10,000 miles) or
every 12 months, and add lubricant
to within 0 to 10 mm (0 to 0.4 inch)
of the bottom edge of the filler hole
if necessary.
27. Power Steering Fluid :
Replace power steering fluid every
24 months or 48 000 km
(30,000 miles), whichever occurs
first.
28. Power Steering Oil Hoses :
Replace power steering oil hoses
every 24 months or 80 000 km
(50,000 miles), whichever occurs
first.
29. Steering Wheel Free Play :
Check steering wheel free play after
the first 1 040 km (650 miles) and
then every 10 400 km (6,500 miles).
Steering wheel free play
10-50 mm (0.39-1.97 in) 30. Steering Gear Box Torque :
Retighten the attaching bolts of the
steering gear box to the specified
torque every 12 months or every
32 000 km (20,000 miles) whichever
occurs first.
Steering gear box tightening torque
103 Y(76 lb·ft)
31. Driveshaft Flange Torque :
Check the fixing bolts of driveshaft
flange for looseness or damage
after the first 16 000 km
(10,000 miles). Driveshaft flange tightening torque
103Y(76 lb·ft)
32. Driveshaft Lubrication :
Lubricate the grease fitting on the
center bearing, as well as each
universal joint and spline coupling
every 12 months or 16 000 km
(10,000 miles) whichever occurs
first.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
Service and Maintenance 349
Recommended Fluids, Lubricants, and Parts
Recommended Fluids and Lubricants
Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer.Usage Fluid/Lubricant
Automatic Transmission Automatic Transmission Fluid (GM Part No. 19354076).
Battery Terminals Petroleum Jelly (outer surfaces)
Brake Fluid DOT 3 Hydraulic Brake Fluid (GM Part No. 19353126).
Cab-Door Hinges and Latches
Lubricant Multi-Purpose Lubricant, Superlube (GM Part No. 12346241) or equivalent
containing zinc oxide.
Chassis Lubricant Chassis Lubricant (GM Part No. 12377985) or high temperature equivalent.
Diesel Exhaust Fluid (DEF) Diesel Exhaust Fluid (GM Part No. 19353126) or diesel exhaust fluid that meets ISO 22241-1 or displays the API Diesel Exhaust Fluid
Certification Mark.
Driveshaft Center Bearing, Wheel
Hub Bearing Lubricant NLGI #2 or #3
Driveshaft, Universal Joints and
Sliding Sleeve Lubricant NLGI #1 or #2 multi-purpose type grease
Engine Coolant 50/50 mixture of clean, drinkable water and GM extended life coolant. (GM Part No. 12378560) SeeEngine Coolant0253.

Chevrolet Low Cab Forward 5.2L Diesel Engine 4500/5500 Series (GMNA-
Localizing-U.S.-12407814) - 2019 - crc - 12/13/17
350 Service and Maintenance
UsageFluid/Lubricant
Engine Oil Engine oils with the letters CK-4 are required for your vehicle. The CK-4
designation can appear either alone or in combination with other American
Petroleum Institute (API) designations, such as API CK-4/SL. These letters
show API levels of quality. To determine the preferred viscosity for your
vehicle's diesel engine, see Engine Oil0245.
Hydraulic Brake Booster (If
Equipped) DEXRON
®-VI Automatic Transmission Fluid.
Power Steerig Fluid DEXRON
®-VI Automatic Transmission Fluid.
Rear Axle Multi purpose gear oil SAE80W-90 GL-5, SAE90 GL-5
Rear Axle
(Limited slip differential (LSD)) Multi purpose gear oil SAE80W-90 GL-5, SAE90 GL-5 for limited slip
differential together with limited slip differential lubricant additive (GM
Part No. 88900330) or equivalent.
Windshield Washer Solvent Automotive windshield washer fluid that meets regional freeze protection
requirements.