ALLISON MT643 TRANSMISSION SPECIFICATION

 

 

Specialiazing in Repair, Maintenance, Overhaul of Allison Transmission : Allison MT 643

 

Maju Engineering Services Sdn. Bhd (MESSB) offers not only new Allison Transmissions but we also have a vast stock of rebuilt Allison Transmissions. The gearboxes are overhauled by factory trained mechanics who with the use of new and genuine Allison parts create an automatic transmission which is as good as new.

Every rebuilt transmission is fitted with new bearings and where applicable the latest modifications are implemented. Finally every rebuilt transmission is severely tested under load. All this results in a high quality rebuilt transmission which equals a brand new transmission. Drive Line Systems has a vast stock of rebuilt AT/MT/HT/CLT transmissions but we are also able to offer rebuilt Off-Highway transmissions like the CL(B)T5000 and 6000 Series.

Today's engine and axle options have made specifying a truck more demanding. We can help. Whether you're looking for enhanced fuel economy, increased productivity or high performance, we have the tools to help you select an Allison Transmission that will match your specific application needs.

So if you are searching for a rebuilt Allison MT 643 transmission so you can proceed with your business as soon as possible, don’t hesitate to contact us and ask for a quotation which meets your requirements.

ALLISON MT 643 SPECIFICATIONS
P&D, Utility Truck and Dump Truck Rating
Net input power 250 hp (186 kW)
Net input torque 640 lb-ft (868 Nm)
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 Nm)
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 Nm)
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 Nm)
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 (Nm)].


MECHANICAL RATIOS (RANGE)*
First
3.58:1
Second
2.09:1
Third
1.39:1
Fourth
1.00:1
Reverse
-5.67:1


RATIO COVERAGE
Forward
3.58
*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 Nm)


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
Torque Power
626 lb-ft (850 Nm) 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.


 

Model No.
   
175
235
603
445
186
250
868
640
332
445
1945
1435
205
275
1085
800
     
Off Highway Series TORQMATIC SERIES 1000 SERIES
2000 SERIES 3000 SERIES 4000 SERIES
ENGINE DRIVEN PTO ALLISON TORQUE CONVERTER POWER
SHIFT TRANSMISSIONS
4th gen transmission    
     
     
     



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