Paccar Kenworth T680 2019, Manual

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5-3
Section 5
Exhaust & Aftertreatment
GENERAL GUIDELINES FOR DEF SYSTEM
The installation of the DEF tank is a critical component of the aftertreatment system. While Kenworth does not recom-
mend relocating the DEF tank, there are applications and body installations that will require it. The guidelines below must
be strictly followed by any entity relocating the tank. Failure to follow the guidelines completely and accurately may result
in engine shut-down situations.
PACCAR-approved DEF hoses are required when retrofitting for system to function properly. The use of unapproved hoses
for DEF lines will void warranty and may cause engine shut-down situations. The DEF pump (or Supply Module) cannot be
relocated from the DEF tank.
Kenworth offers a variety of DEF tank sizes to meet every application. The DEF tank volume is regulated by the E.P.A.
Kenworth advises against modifying the tank volume after the truck has been delivered from the factory. These are esti-
mated nominal (published) maximum fuel capacities for various DEF tanks, engines, and fill ratios. Dosing rates for these
calculations are also shown.
TABLE 5-1.
FUEL VOLUME ALLOWED (USABLE GALLONS)
Standard DEF-Fuel Ratio
(2:1)
Minimum Recommended DEF-Fuel Ratio
(1:1), No Derates
Minimum Required DEF-Fuel Ratio
(1:1), First Derate Allowed
DEF Tank
PX-7 /
ISX15
ISX12
MX-11/
MX-13
PX-9
PX-7/
ISX15
ISX12
MX-11/
MX-13
PX-9
PX-7/
ISX15
ISX12
MX-11/
MX-13
PX-9
SMALL
153 162 113 189 193 204 152 238 245 260 191 303
MEDIUM
286 303 212 353 387 409 286 477 458 484 339 565
LARGE
431 455 318 531 581 614 430 717 689 728 510 850
MEDIUM AERO
291 307 215 358 393 416 308 485 464 491 361 573
LARGE AERO
368 389 272 454 538 569 419 664 585 618 453 721
Rectangular
103 109 76 128 148 157 110 183 176 186 130 217
Engine Nominal DEF
Dosing Rate
(as a percentage
of fuel volume)
PX7 /ISX15 3.7%
ISX12 3.5%
MX-11/MX-13 5.0%
PX9 3.0%