|
| MT
643(R) Specification Sheet |
|
| |
| SPECIFICATIONS |
| P&D,
Utility Truck and Dump Truck Rating |
|
Net input power |
250 hp (186 kW) |
|
Net input torque |
640 lb-ft (868 N·m) |
|
Vehicle weight |
Up to 73,280 lbs (33,240 kg) GVW or GCW |
|
| Fire
Truck Pumper, Non-Pumper and Aerial Truck Rating |
|
Net input power |
250 hp (186 kW) |
|
Net input torque |
640 lb-ft (868 N·m) |
|
Vehicle weight |
Up to 55,000 lbs (24,948 kg) GVW |
|
| Intercity
Coach, Motorhome and School Bus Rating |
|
Net input power |
250 hp (186 kW) |
|
Net input torque |
640 lb-ft (868 N·m) |
|
Vehicle weight |
Up to 42,000 lbs (19,051 kg) GVW or GCW |
|
| Transit
Bus and Airport Shuttle Bus Rating |
|
Net input power |
210 hp (156 kW) |
|
Net input torque |
590 lb-ft (800 N·m) |
|
Vehicle weight |
Up to 37,500 lbs (17,000 kg) GVW |
|
|
| ENGINE
INTERFACE |
| Acceptable
full-load engine governed speed |
2200-4000
rpm Non-Retarder model (MT643)
2200-2600 rpm Retarder model (MT643R) |
Minimum
engine idle speed
(with transmission in drive) |
500 rpm |
|
|
| MOUNTING |
|
Engine |
SAE No. 2 |
| Chassis
|
Four-bolt mounting pad, each side
(Rear support required for some installations) |
|
|
| TORQUE
CONVERTER |
STALL
TORQUE RATIO |
Kp-FACTOR*
AT STALL |
| TC-350 |
3.04 |
173.8
(149.2) |
| TC-360 |
2.86 |
142.2
(122.1) |
| TC-370 |
2.40 |
115.3
(99.0) |
| TC-378 |
2.27 |
114.0
(97.9) |
| TC-380 |
1.82 |
92.7
(79.6) |
|
| *Kp-Factor
defines torque converter capacity. Kp = the ratio of converter pump speed
[rpm] divided by the square of pump torque [lb-ft (N·m)]. |
|
|
| MECHANICAL
RATIOS (RANGE)* |
|
First |
|
|
Second |
|
|
Third |
|
|
Fourth |
|
|
Reverse |
|
|
|
| RATIO
COVERAGE |
|
Forward |
|
|
*Gear ratios do not include torque converter multiplication. |
|
|
| CONTROL
SYSTEM |
| Description
|
Hydraulic |
| Driver-to-Transmission
Interface |
Customer furnished cab-mounted shift selector |
|
|
| CONVERTER-DRIVEN
POWER TAKEOFF PROVISION ? RIGHT SIDE |
|
PTO drive gear rating |
Continuous ? 1.00 x turbine speed, 300 lb-ft (407 N·m) |
|
|
| SPEEDOMETER
PROVISION (Only one may be specified) |
|
Optional Speed Sensor Gear |
16-tooth gear for magnetic pickup |
|
Optional Mechanical Drive Gear |
5-tooth helical drive gear for mechanical driven gear |
|
Optional Mechanical Drive Gear |
8-tooth helical drive gear for mechanical driven gear |
|
Location |
Transmission rear cover |
|
|
| OPTIONAL
RETARDER PROVISION |
|
Input |
Coupling-type rotor between fixed stators. Integral, hydraulic |
|
Capacity
at 2600 rpm |
|
|
|
|
626 lb-ft (850 N·m) |
310 hp (231 kW) |
|
|
|
| OIL
SYSTEM |
|
Oil type |
Dexron® III, C4 |
|
Capacity (excluding external circuits) |
15.0
qts (14.0 liters) standard oil pan |
| |
12.0 qts (11.0 liters) optional shallow oil pan |
| |
Retarder
models add 1.6 qts (1.5 liters) |
|
Filters ? main and cooler (optional) |
Replaceable element, remote mounted |
|
|
| SIZE |
|
Length* |
31.9 in (809 mm) |
|
Depth (below transmission centerline) |
12.7 in (324 mm) Standard oil pan |
| |
12.0 in (305 mm) Optional shallow oil pan |
|
Weight (dry without retarder) |
510 lbs (231 kg) |
|
Weight (dry with retarder) |
555 lbs (251 kg) |
|
*Length from engine housing to output flange face. |
|
|
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|
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