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Allison 6620

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The Advantages of an Allison Transmission, Copeland International, Houston

Allison 6620

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Description

Ratings
Product Name Net Input Torque lb-ft (N.M) Net Input Power hp (kW) Turbine Torque lb-ft (N.M) Vocations
S6620, M6620 (Manual, Hydraulic, Manual Electric, Automatic Electric Controls) 2750 (3729) 900 (671) 4000 (5423) Oil Field Pumpers, Frac, Cementing,
Drilling, Well Service, Heavy Trucks

ENGINE INTERFACE

  • Acceptable full-load engine governed speed: 1900-2500 rpm
  • Minimum engine idle speed range (with the transmission in Drive): 550 rpm

MOUNTING

  • Direct: SAE No.1 flywheel housing with flexplate drive. Cradle mount using engine flywheel
    housing mounting pads and transmission rear cover mounting pads with 0.625-11 inch series bolts
  • Remote: Side pads on transmission rear cover, plus front trunnion mount.

TORQUE CONVERTER

Model Stall Torque Ratio Kp-Factor* at Stall
TC-680 (with retarder) 2.17 53.2 (45.7)
TC-680 (without retarder) 2.08 54.6 (46.9)
TC-682 1.77 43.7 (37.5)
TC-683 1.85 35.1 (30.1)

MECHANICAL RATIOS

Gear ratios do not include torque converter multiplication)

First 4.00 : 1
Second 2.68 : 1
Third 2.01 : 1
Fourth 1.35 : 1
Fifth 1.00 : 1
Sixth 0.67 : 1
Reverse 1 – 5.15 : 1
Reverse 2 – 3.44 : 1
In forward range 5.97

CONTROL SYSTEM

Description Automatic Electronic, Manual Electric, Manual Hydraulic
Shift Sequences [C = Converter Mode (lockup clutch disengaged); L = Lockup Mode (lockup clutch engaged)] 1C–1L–2C–2L–3C–3L–4C–4L–5C–5L–6C–6L
Driver-to-Transmission Interface Customer furnished, cab-mounted shift selector

PHYSICAL DESCRIPTION

Length (engine housing to flange face)
  • Basic:
  • With retarder provision:
  • 54.3 in (1380 mm)
  • 57.8 in (1467 mm)
Width
  • Basic:
  • With retarder provision:
  • 25.9 in (658 mm)
  • 29.4 in (747 mm)
Depth (below horizontial center line) 20.1 in (511 mm)
Height (above horizontial centerline)
  • Basic:
  • With direct mount filters:
  • 13.7 in (348 mm)
  • 18.2 in (462 mm)
Dry Weight
  • Basic:
  • Top engine-driven PTO drive gear:
  • Park Brake (12” x 5”):
  • Remote Mount Provision:
  • Retarder Provision:
  • 2200 lb (998 kg)
  • Add 30 lb (14 kg)
  • Add 60 lb (27 kg)
  • Add 55 lb (25 kg)
  • Add 165 lb (75 kg)

SIDE ENGINE-DRIVEN POWER TAKE-OFF PROVISION

PTO drive Engine-driven spur gear
PTO mounting pad Eight-bolt, 4 o’clock position (as viewed from rear of transmission)
PTO drive gear ratio 1.00 x engine speed
PTO drive gear rating Intermittent: 200 hp (149 kW) and Continuous: 125 hp (93 kW)

LIGHT DUTY ACCESSORY DRIVE

Accessory drive Engine-driven, internal spline
Accessory drive mounting pad Location: 4 o’clock position (as viewed from rear of transmission)

Orientation: Toward rear of transmission
Accessory drive ratio 1.00 x engine speed
Accessory drive rating Torque: 25 lb-ft (24 N m)

Power: 10 hp (7.5 kW)

TOP ENGINE-DRIVEN POWER TAKE-OFF PROVISION (OPTION)

PTO drive Engine-driven spur gear

 
PTO mounting pad Eight-bolt, 12 o’clock position (as viewed from rear of transmission)

 
PTO drive gear ratio 1.21 x engine speed

 
PTO drive gear rating

 
  • Intermittent: 200 hp (298 kw)
  • Continuous: 125 hp (224 kw)

INPUT RETARDER PROVISION (OPTION)

Type Integral, hydraulic – Coupling-type rotor between fixed stators
Capacity at 2100 rpm
  • Torque: 1500 lb-ft (2034 N m)
  • Power: 600 hp (447 kW)

OIL SYSTEM

Oil Type C-4

 
Capacity Excluding external circuits 18.0 Gallons (68 liters)

 
Main Circuit Oil Filter
  • Standard: Manifold for full-flow, remote mounted, replaceable element
  • Optional: Direct-mount full flow, replaceable elements (2)
Cooler circuit oil filter (optional)

 

 Replaceable element, remote-mounted

SPEEDOMETER PROVISIONS

Electronic: Location: LS-TTL signal, 39 pulses per output shaft revolution
Output signal from transmission ECU
Mechanical Drive: Location: SAE “Heavy Duty” 5/32-inch; Ratio 0.50: 1
Transmission rear cover

PARK BRAKE PROVISION

  • Type (customer supplied): 12 x 5-inch drum
  • Capacity at lever apply force: 90,000 lb-in at 517 lbf (10,168 N*m at 2058 N)

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