Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
Service and Maintenance 313
rocker shaft bracket nuts before
checking and adjusting valve
clearance.
Check and adjust valve clearance
every 80 000 km (50,000 miles) or
12 months whichever occurs first.
3. Engine Oil and Oil Filter :
Change at interval noted below
depending upon driving conditions.
•Normal Service —Change every
16 000 km (10,000 miles) or
12 months whichever occurs first.
• Severe Service —Change every
8 000 km (5,000 miles) or 3 months
if you often drive under one or more
of these conditions: (a) driving in
dusty areas, (b) frequent idling or
idling for long periods, (c) driving
6 km (4 miles) or less in freezing
weather, or other short trips in cold
weather, where the engine does not
thoroughly warm up.
Change oil and filter as soon as you
can after driving in a dust storm.
When recommended oil is used, it
conforms to this maintenance
schedule. (Recommended oil: CK-4
(API designations)) 4. Fuel Filter :
Replace the fuel
filter every 24 000 km (15,000 miles)
or more frequently if clogged or
replace when the fuel filter indicator
light comes on (if equipped).
5. Pre-Fuel Filter/Water
separator : Replace the fuel filter
every 24 000 km (15,000 miles) or
more frequently if clogged or
replace when the fuel filter indicator
light comes on (if equipped).
6. Air Cleaner Filter : The level of
dirt in the air cleaner element can
be checked against the indicator.
Replace the air cleaner filter when
the Driver Information Center (DIC)
shows "CHECK AIR FILTER".
7. Damage to Air Intake Ducts and
Hoses : Check for damage of air
intake ducts and hoses and that
those are correctly installed every
24 000 km (15,000 miles) or
12 months. Replace or adjust those
if necessary. 8. Drive Belts :
Check belt driving
the fan, alternator or A/C
compressor every 16 000 km
(10,000 miles). Look for cracks,
fraying, wear, and proper tension.
9. Engine Bolt Torques : Loosened
bolts result in lower engine output.
Check and adjust manifold
mounting, and injectors to correct
torque every 80 000 km
(50,000 miles).
10. Rotate Tires : To equalize wear,
rotate tires and adjust tire pressures
every 10 400 km (6,500 miles). See
Tire Rotation 0284.
11. Engine Cooling System : At
12 months or 16 000 km
(10,000 miles) intervals, wash
radiator cap and filler neck with
clean water, pressure test system
and radiator cap for proper pressure
holding capacity, tighten hose
clamps and inspect condition of all
cooling and heater hoses. Replace
hoses if cracked, swollen or
otherwise deteriorated. Have the
hoses replaced by your authorized
dealer.
Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
336 Technical Data
Valve clearance (Between
cam and roller)Both intake and exhaust valves:
0.6 mm (0.024 in) in cold engine
Idling speed 500 - 600 r/min
Fan belt tension New belt: 5 - 7 mm (0.20 - 0.28 in)/184 - 206 Hz
When used: 8 - 9 mm (0.31 - 0.35 in)/158 - 170 Hz
Oil filter Cartridge
Engine oil capacity When changing oil and filter:
11.0 L (11.6 qt)
*1
Engine coolant capacity 19.6 L (20.7 qt)*2
Preheating system Glow plugs
Transmission Specifications
Model A465 Model Six-speed automatic transmission (overdrive gear for 5th and 6th), lock-up clutch for
2nd to 6th
Gear ratio 1st 3.742 to 1 2nd 2.003 to 13rd 1.343 to 1
4th 1.000 to 1
5th 0.773 to 1
6th 0.634 to 1
Reverse 3.539 to 1
Transmission oil capacity 13.1 L (27.7 pt)
Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
Technical Data 337
Weights
Axle weight rating : Front 4500HD: 2431 kg (5,360 lb)4500XD: 3007 kg (6,630 lb)
5500HD: 3098 kg (6,830 lb) 5500XD: 3300 kg (7,275 lb)
Engine Oil Service
Engine oil capacity When changing oil only: 9.5 L (10.0 qt)
*1
When changing oil and filter: 11.0 L (11.6 qt)*1
Engine Cooling System Service
Capacity 19.6 L (20.7 qt)
Engine oil Thermostat:
Starts to open 82-85 °C (180-185 °F)
Radiator pressure 108 kPa (16 psi)
Transmission Service
Transmission oil capacity 13.1 L (27.7 qt)
*3
Rear Axle Service
Differential gear oil
capacity 4500HD/4500XD:
9.0 L (19.0 qt)
*4
5500HD/5500XD:10.0 L (21.1 qt)*4
Limited slip differential
lubricant additive 4500HD/4500XD:
0.5 L (1.06 qt)*5
5500HD/5500XD:0.6 L (1.27 qt)*5
Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
340 Technical Data
Oil filter—
Oil filter cartridge 63.7 Y(6.5 kgf m/47.0 lb ft)
Remarks:
*1see Engine Oil 0223.
Remarks:*2see Engine Coolant 0231.
Remarks:*3see Automatic Transmission Fluid 0229.
Remarks:*4see Rear Axle (Gear Oil Viscosity Chart) 0249 orRear Axle (Oil Level Check) 0249.
Remarks:*5only for vehicles equipped with optional limited slip differential.
Remarks:*6The fuel tank capacity is stated on a metal plate attached to the fuel tank body. Only fill the tank to
95 percent of its capacity; this allows room for the expansion of the fuel.
Remarks:
*7larger capacity batteries 31 (180-930) × 2 can also be used. However, do not mix batteries of different
types and from different makers.
