Machine models

Cat 311B to 312C L specifications

Entries in this reference
Listing-entry count
5

Short answer

Cat 311B to 312C L: full-size excavators.

Selected configuration figures
Configuration	Documented field and quantity
311B	Gross Power 85 hp Operating Weight 24,527 lb
312B	Gross Power 91 hp Operating Weight 27,410 lb
312B L	Gross Power 91 hp Operating Weight 28,010 lb
312C	Gross Power 94 hp Operating Weight 28,170 lb
312C L	Gross Power 94 hp Operating Weight 28,970 lb

311B to 312C L specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Cat	311B to 312C L	5	311B, 312B, 312B L, 312C, and 312C L

Boom/Stick Option (Hex) 1
Specification	311B	312B	312B L	312C	312C L
Max Cutting Height	25.14 ft	27.01 ft	27.01 ft	27.81 ft	27.1 ft
Max Loading Height	17.39 ft	19.23 ft	19.23 ft	20 ft	20 ft
Max Reach Along Ground	23.92 ft	25.56 ft	25.56 ft	26.83 ft	26.83 ft
Max Vertical Wall Digging Depth	13.62 ft	14.54 ft	14.54 ft	16.31 ft	16.33 ft
Max Digging Depth	15.56 ft	16.84 ft	16.84 ft	18.21 ft	18.25 ft
Boom/Stick Option (Hex) 1	Boom 14\'1\" (4300mm) / Stick 1950mm	boom w/ stick 2100mm	boom w/ stick 2100mm	Boom 15'3" (4650mm)/ Stick 8'2" (2500mm)	Stick Length 2500mm (8' 2")

Specification	312C	312C L
Shipping Length Of Unit	24.84 ft	24.83 ft
Shipping Height Of Unit	9.06 ft	9.08 ft

Dimensions and weight
Specification	311B	312B	312B L	312C	312C L
Ground Clearance	1.45 ft	1.45 ft	1.45 ft	1.45 ft	1.42 ft
Height To Top Of Cab	9.06 ft	9.06 ft	9.06 ft	9.06 ft	9.08 ft
Width To Outside Of Tracks	8.17 ft	8.17 ft	8.17 ft	8.5 ft	8.5 ft
Length Of Track On Ground	8.57 ft	9.13 ft	9.98 ft	9.13 ft	9.08 ft
Tail Swing Radius	6.99 ft	6.99 ft	6.99 ft	6.99 ft	7 ft

Specification	311B	312B	312B L
Removal Counterweight Clearance	3.02 ft	3.02 ft	3.02 ft

Specification	312C L
Transport Width	2.53 ft

Undercarriage
Specification	311B	312B	312B L	312C	312C L
Track Gauge	6.53 ft	6.53 ft	6.53 ft	6.53 ft	6.5 ft
Shoe Size	19.69 in	19.69 in	19.69 in	24 in	24 in
Drawbar Pull	20,720 lb	22,930 lb	22,930 lb	24,729 lb	24,720 lb
Ground Pressure	5.51 psi	5.66 psi	5.51 psi	4.79 psi	4.5 psi
Max Travel Speed	3.42 mph	3.42 mph	3.42 mph	3.42 mph	3.4 mph

Engine
Specification	311B	312B	312B L
Number Of Cylinders	4	4	4

Specification	311B	312B	312B L	312C	312C L
Engine Model	3064T	3064T	3064T	3046 T	3064T
Net Power	79 hp	84 hp	84 hp	90 hp	90 hp
Gross Power	85 hp	91 hp	91 hp	94 hp	94 hp
Power Measured @	1,800 rpm	1,900 rpm	1,900 rpm	1,950 rpm	1,950 rpm
Displacement	259 cu in	259 cu in	259 cu in	259.4 cu in	259 cu in
Aspiration	Turbocharged	Turbocharged	Turbocharged	Turbocharged	Turbocharged

Specification	311B	312B	312B L	312C L
Bore	4 in	4.1 in	4.1 in	4 in
Stroke	5.1 in	5.2 in	5.2 in	5.1 in
Flywheel Power	79 hp	84 hp	84 hp	90 hp
Eec 80/1269	79 hp	84 hp	84 hp	90 hp
SAE J1349	78 hp	84 hp	83 hp	90 hp
ISO 9249	79 hp	84 hp	84 hp	90 hp

Operational
Specification	311B	312B	312B L	312C	312C L
Operating Weight	24,527 lb	27,410 lb	28,010 lb	28,170 lb	28,970 lb
Fuel Capacity	66.1 gal	66.1 gal	66.1 gal	66.1 gal	66 gal
Cooling System Fluid Capacity	4.1 gal	4.1 gal	4.1 gal	4.7 gal	4.6 gal
Hydraulic System Fluid Capacity	41.5 gal	42.8 gal	42.8 gal	42.8 gal	42.8 gal
Engine Oil Capacity	3.5 gal	3.5 gal	3.5 gal	4.7 gal	4.6 gal
Swing Drive Fluid Capacity	0.8 gal	0.8 gal	0.8 gal	0.8 gal	0.8 gal
Alternator Supplied Amperage	50 amps	50 amps	50 amps	55 amps	50 amps
Hydraulic System Relief Valve Pressure	4,980 psi	4,980 psi	4,980 psi	4,980 psi	4,340 psi
Hydraulic Pump Flow Capacity	57.1 gpm	63.5 gpm	63.5 gpm	33.5 gpm	33.5 gpm

Specification	311B	312B	312B L	312C L
Operating Voltage	24 V	24 V	24 V	24 V

Swing Mechanism
Specification	311B	312B	312B L	312C	312C L
Swing Speed	10.8 rpm	12.3 rpm	12 rpm	12.9 rpm	12.4 rpm
Swing Torque	22,422 lb-ft	22,422 lb-ft	22,422 lb-ft	22,496 lb-ft	22,830 lb-ft

Weights
Specification	311B	312B	312B L	312C L
Operating Weight	27,680 lb	28,680 lb	31,110 lb	28,970 lb

Specification	312C L
Operating Weight - Long Undercarriage	29,010 lb

Buckets
Specification	311B	312B	312B L	312C	312C L
Reference Bucket Capacity	0.6 yd3	0.6 yd3	0.6 yd3	0.8 yd3	0.8 yd3
Minimum Bucket Capacity	0.5 yd3	0.5 yd3	0.5 yd3	0.4 yd3	0.4 yd3
Maximum Bucket Capacity	1.1 yd3	1.1 yd3	1.1 yd3	1 yd3	1 yd3

Hydraulic System
Specification	311B	312B	312B L	312C L
Pilot System - Maximum Flow	4.5 gpm	4.8 gpm	4.8 gpm	6.3 gpm
Pilot System - Maximum Pressure	570 psi	570 psi	570 psi	600 psi
Maximum Pressure - Travel	4,980 psi	4,980 psi	4,980 psi	4,980 psi
Maximum Pressure - Swing	3,340 psi	3,340 psi	3,340 psi	3,340 psi
Maximum Pressure - Implements	4,340 psi	4,340 psi	4,340 psi	4,340 psi
Main Implement System - Maximum Flow (2x)	28 gpm	32 gpm	64 gpm	33.5 gpm
Boom Cylinder - Bore	4 in	4.3 in	4.3 in	4.3 in
Boom Cylinder - Stroke	40 in	40 in	40 in	40 in
Stick Cylinder - Bore	4.3 in	4.8 in	4.8 in	4.7 in
Stick Cylinder - Stroke	47 in	47 in	47 in	47.1 in

Specification	311B	312B	312C L
Bucket Cylinder - Bore	4 in	4 in	3.9 in
Bucket Cylinder - Stroke	37 in	37.5 in	37 in

Specification	312C L
Blade - Maximum Flow	15.5 gpm
Blade System - Maximum Pressure	2,990 psi

Service Refill Capacities
Specification	311B	312B	312B L	312C L
Cooling System	4.1 gal	4.1 gal	4.1 gal	4.6 gal
Fuel Tank	66 gal	66 gal	66 gal	66 gal
Final Drive - Each	0.7 gal	0.7 gal	0.7 gal	0.7 gal
Hydraulic Tank	25.9 gal	25.9 gal	25.9 gal	23.8 gal
Hydraulic System - Including Tank	41.5 gal	42.8 gal	42.8 gal	42.8 gal
Engine Oil	3.4 gal	3.4 gal	3.4 gal	4.6 gal
Swing Drive - Each	0.8 gal	0.8 gal	0.8 gal	0.8 gal

Drive
Specification	311B	312B	312B L	312C L
Maximum Drawbar Pull	20,720 lb	22,930 lb	22,930 lb	25,200 lb
Travel Speed	3.4 mph	3.4 mph	3.4 mph	3.5 mph

Variants — Source comparison annotation
Source guide	Differing-field count reported
311B to 312C L	71

Ratios
Figure	311B	312B	312B L	312C	312C L
Engine horsepower per 1,000 lb of weight	3.2	3.1	3.0	3.2	3.1
Fuel tank per engine horsepower	0.84 gal	0.79 gal	0.79 gal	0.73 gal	0.73 gal
Hydraulic power from the listed pump flow and relief pressure	165.9 hp	184.5 hp	184.5 hp	97.3 hp	84.8 hp

311B to 312C L: owner reports

Sources: 3 forum discussions about the Caterpillar 311 excavators (311B, 311C); heavyequipmentforums.com.

Cat: Slow track, travel speed and bogging.

Sources: 3 forum discussions about the Caterpillar 312 excavators (312, 312E); heavyequipmentforums.com.

Cat: Throttle dial, one-sided tracking and controller trouble.

311B to 312C L: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	full-size excavator	Cat and the 311B, 312B, 312B L, 312C	144

Topics named by those titles
Title topic	Titles
hydraulics	27
tracks and undercarriage	8
transmission and drive	8

Topic in the title	Threads	Share of matching threads
hydraulics	27	19%
tracks and undercarriage	8	6%
transmission and drive	8	6%
electrical and sensors	5	3%
brakes and steering	3	2%

CAT 311b Tracking Issue (Heavy Equipment Forums, 2026-07-15)
CAT 312c Pump Regulators (Heavy Equipment Forums, 2026-04-13)
CAT 312 C Aux Pipes (Heavy Equipment Forums, 2026-02-11)
Caterpillar 312 C (Heavy Equipment Forums, 2026-02-10)

Used market for the 311B to 312C L — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Cat full-size excavator	25

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
311B	1	1996	$25,000	$25,000	$25,000	None shown
312B	3	1998 to 2002	$15,000	$20,528	$15,500	None shown
312B L	3	1998 to 2002	$15,000	$20,528	$15,500	None shown
312C	9	2002 to 2007	$20,859	$45,000	$33,021	6,899
312C L	9	2002 to 2007	$20,859	$45,000	$33,021	6,899

311B to 312C L: recall reference — Dated CPSC search
Search date	Database	Names queried	Search result
2026-09-24	U.S. Consumer Product Safety Commission	Cat together with the full-size excavator 311B, 312B, 312B L, 312C	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Cat 311B — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Cat 312B — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Cat 312B L — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Cat 312C — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Cat 312C L — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Cat 311B to 312C L — Heavy Equipment Forums. Observed 2026-09-24.
Forum threads	Forum threads: Forum threads read for the Caterpillar 311 excavators (311B, 311C) — Heavyequipmentforums. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Cat 311B — MachineryTrader. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Cat — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Cat 311B to 312C L: Configuration records

311B

Specification	Source figure
Boom/Stick Option (Hex) 1
Max Cutting Height	25.14 ft
Max Loading Height	17.39 ft
Max Reach Along Ground	23.92 ft
Max Digging Depth	15.56 ft
Boom/Stick Option (Hex) 1	Boom 14'1" (4300mm) / Stick 1950mm
Max Vertical Wall Digging Depth	13.62 ft
Dimensions and weight
Ground Clearance	1.45 ft
Height To Top Of Cab	9.06 ft
Tail Swing Radius	6.99 ft
Removal Counterweight Clearance	3.02 ft
Length Of Track On Ground	8.57 ft
Width To Outside Of Tracks	8.17 ft
Undercarriage
Drawbar Pull	20,720 lb
Max Travel Speed	3.42 mph
Shoe Size	19.69 in
Ground Pressure	5.51 psi
Engine
Engine Model	3064T
Gross Power	85 hp
Net Power	79 hp
Displacement	259 cu in
Bore	4 in
Stroke	5.1 in
Flywheel Power	79 hp
Number Of Cylinders	4
Power Measured @	1,800 rpm
Aspiration	Turbocharged
Eec 80/1269	79 hp
SAE J1349	78 hp
ISO 9249	79 hp
Operational
Fuel Capacity	66.1 gal
Cooling System Fluid Capacity	4.1 gal
Hydraulic System Fluid Capacity	41.5 gal
Engine Oil Capacity	3.5 gal
Swing Drive Fluid Capacity	0.8 gal
Operating Voltage	24 V
Hydraulic System Relief Valve Pressure	4,980 psi
Hydraulic Pump Flow Capacity	57.1 gpm
Alternator Supplied Amperage	50 amps
Swing Mechanism
Swing Torque	22,422 lb-ft
Swing Speed	10.8 rpm
Buckets
Reference Bucket Capacity	0.6 yd3
Minimum Bucket Capacity	0.5 yd3
Maximum Bucket Capacity	1.1 yd3
Hydraulic System
Pilot System - Maximum Flow	4.5 gpm
Pilot System - Maximum Pressure	570 psi
Maximum Pressure - Travel	4,980 psi
Maximum Pressure - Swing	3,340 psi
Boom Cylinder - Bore	4 in
Boom Cylinder - Stroke	40 in
Stick Cylinder - Bore	4.3 in
Stick Cylinder - Stroke	47 in
Bucket Cylinder - Bore	4 in
Bucket Cylinder - Stroke	37 in
Maximum Pressure - Implements	4,340 psi
Main Implement System - Maximum Flow (2x)	28 gpm
Service Refill Capacities
Cooling System	4.1 gal
Final Drive - Each	0.7 gal
Hydraulic Tank	25.9 gal
Hydraulic System - Including Tank	41.5 gal
Engine Oil	3.4 gal
Fuel Tank	66 gal
Swing Drive - Each	0.8 gal
Drive
Maximum Drawbar Pull	20,720 lb
Travel Speed	3.4 mph
Additional specifications
Track Gauge	6.53 ft
Operating Weight	24,527 lb

Source

312B

Specification	Source figure
Boom/Stick Option (Hex) 1
Max Cutting Height	27.01 ft
Max Loading Height	19.23 ft
Max Reach Along Ground	25.56 ft
Max Digging Depth	16.84 ft
Boom/Stick Option (Hex) 1	boom w/ stick 2100mm
Max Vertical Wall Digging Depth	14.54 ft
Dimensions and weight
Ground Clearance	1.45 ft
Height To Top Of Cab	9.06 ft
Tail Swing Radius	6.99 ft
Removal Counterweight Clearance	3.02 ft
Length Of Track On Ground	9.13 ft
Width To Outside Of Tracks	8.17 ft
Undercarriage
Drawbar Pull	22,930 lb
Max Travel Speed	3.42 mph
Shoe Size	19.69 in
Ground Pressure	5.66 psi
Engine
Engine Model	3064T
Gross Power	91 hp
Net Power	84 hp
Displacement	259 cu in
Bore	4.1 in
Stroke	5.2 in
Flywheel Power	84 hp
Number Of Cylinders	4
Power Measured @	1,900 rpm
Aspiration	Turbocharged
Eec 80/1269	84 hp
SAE J1349	84 hp
ISO 9249	84 hp
Operational
Fuel Capacity	66.1 gal
Cooling System Fluid Capacity	4.1 gal
Hydraulic System Fluid Capacity	42.8 gal
Engine Oil Capacity	3.5 gal
Swing Drive Fluid Capacity	0.8 gal
Operating Voltage	24 V
Hydraulic System Relief Valve Pressure	4,980 psi
Hydraulic Pump Flow Capacity	63.5 gpm
Alternator Supplied Amperage	50 amps
Swing Mechanism
Swing Torque	22,422 lb-ft
Swing Speed	12.3 rpm
Buckets
Reference Bucket Capacity	0.6 yd3
Minimum Bucket Capacity	0.5 yd3
Maximum Bucket Capacity	1.1 yd3
Hydraulic System
Pilot System - Maximum Flow	4.8 gpm
Pilot System - Maximum Pressure	570 psi
Maximum Pressure - Travel	4,980 psi
Maximum Pressure - Swing	3,340 psi
Boom Cylinder - Bore	4.3 in
Boom Cylinder - Stroke	40 in
Stick Cylinder - Bore	4.8 in
Stick Cylinder - Stroke	47 in
Bucket Cylinder - Bore	4 in
Bucket Cylinder - Stroke	37.5 in
Maximum Pressure - Implements	4,340 psi
Main Implement System - Maximum Flow (2x)	32 gpm
Service Refill Capacities
Cooling System	4.1 gal
Final Drive - Each	0.7 gal
Hydraulic Tank	25.9 gal
Hydraulic System - Including Tank	42.8 gal
Engine Oil	3.4 gal
Fuel Tank	66 gal
Swing Drive - Each	0.8 gal
Drive
Maximum Drawbar Pull	22,930 lb
Travel Speed	3.4 mph
Additional specifications
Track Gauge	6.53 ft
Operating Weight	27,410 lb

Source

312B L

Specification	Source figure
Boom/Stick Option (Hex) 1
Max Cutting Height	27.01 ft
Max Loading Height	19.23 ft
Max Reach Along Ground	25.56 ft
Max Digging Depth	16.84 ft
Boom/Stick Option (Hex) 1	boom w/ stick 2100mm
Max Vertical Wall Digging Depth	14.54 ft
Dimensions and weight
Ground Clearance	1.45 ft
Height To Top Of Cab	9.06 ft
Tail Swing Radius	6.99 ft
Removal Counterweight Clearance	3.02 ft
Length Of Track On Ground	9.98 ft
Width To Outside Of Tracks	8.17 ft
Undercarriage
Drawbar Pull	22,930 lb
Max Travel Speed	3.42 mph
Shoe Size	19.69 in
Ground Pressure	5.51 psi
Engine
Engine Model	3064T
Gross Power	91 hp
Net Power	84 hp
Displacement	259 cu in
Bore	4.1 in
Stroke	5.2 in
Flywheel Power	84 hp
Number Of Cylinders	4
Power Measured @	1,900 rpm
Aspiration	Turbocharged
Eec 80/1269	84 hp
SAE J1349	83 hp
ISO 9249	84 hp
Operational
Fuel Capacity	66.1 gal
Cooling System Fluid Capacity	4.1 gal
Hydraulic System Fluid Capacity	42.8 gal
Engine Oil Capacity	3.5 gal
Swing Drive Fluid Capacity	0.8 gal
Operating Voltage	24 V
Hydraulic System Relief Valve Pressure	4,980 psi
Hydraulic Pump Flow Capacity	63.5 gpm
Alternator Supplied Amperage	50 amps
Swing Mechanism
Swing Torque	22,422 lb-ft
Swing Speed	12 rpm
Buckets
Reference Bucket Capacity	0.6 yd3
Minimum Bucket Capacity	0.5 yd3
Maximum Bucket Capacity	1.1 yd3
Hydraulic System
Pilot System - Maximum Flow	4.8 gpm
Pilot System - Maximum Pressure	570 psi
Maximum Pressure - Travel	4,980 psi
Maximum Pressure - Swing	3,340 psi
Boom Cylinder - Bore	4.3 in
Boom Cylinder - Stroke	40 in
Stick Cylinder - Bore	4.8 in
Stick Cylinder - Stroke	47 in
Maximum Pressure - Implements	4,340 psi
Main Implement System - Maximum Flow (2x)	64 gpm
Service Refill Capacities
Cooling System	4.1 gal
Final Drive - Each	0.7 gal
Hydraulic Tank	25.9 gal
Hydraulic System - Including Tank	42.8 gal
Engine Oil	3.4 gal
Fuel Tank	66 gal
Swing Drive - Each	0.8 gal
Drive
Maximum Drawbar Pull	22,930 lb
Travel Speed	3.4 mph
Additional specifications
Track Gauge	6.53 ft
Operating Weight	28,010 lb

Source

312C

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	24.84 ft
Shipping Height Of Unit	9.06 ft
Max Cutting Height	27.81 ft
Max Loading Height	20 ft
Max Reach Along Ground	26.83 ft
Max Digging Depth	18.21 ft
Boom/Stick Option (Hex) 1	Boom 15'3" (4650mm)/ Stick 8'2" (2500mm)
Max Vertical Wall Digging Depth	16.31 ft
Dimensions and weight
Ground Clearance	1.45 ft
Height To Top Of Cab	9.06 ft
Tail Swing Radius	6.99 ft
Length Of Track On Ground	9.13 ft
Width To Outside Of Tracks	8.5 ft
Undercarriage
Drawbar Pull	24,729 lb
Max Travel Speed	3.42 mph
Shoe Size	24 in
Ground Pressure	4.79 psi
Engine
Engine Model	3046 T
Gross Power	94 hp
Net Power	90 hp
Displacement	259.4 cu in
Power Measured @	1,950 rpm
Aspiration	Turbocharged
Operational
Fuel Capacity	66.1 gal
Cooling System Fluid Capacity	4.7 gal
Hydraulic System Fluid Capacity	42.8 gal
Engine Oil Capacity	4.7 gal
Swing Drive Fluid Capacity	0.8 gal
Hydraulic System Relief Valve Pressure	4,980 psi
Hydraulic Pump Flow Capacity	33.5 gpm
Alternator Supplied Amperage	55 amps
Swing Mechanism
Swing Torque	22,496 lb-ft
Swing Speed	12.9 rpm
Buckets
Reference Bucket Capacity	0.8 yd3
Minimum Bucket Capacity	0.4 yd3
Maximum Bucket Capacity	1 yd3
Additional specifications
Track Gauge	6.53 ft
Operating Weight	28,170 lb

Source

312C L

Specification	Source figure
Boom/Stick Option (Hex) 1
Shipping Length Of Unit	24.83 ft
Shipping Height Of Unit	9.08 ft
Max Cutting Height	27.1 ft
Max Loading Height	20 ft
Max Reach Along Ground	26.83 ft
Max Digging Depth	18.25 ft
Boom/Stick Option (Hex) 1	Stick Length 2500mm (8' 2")
Max Vertical Wall Digging Depth	16.33 ft
Dimensions and weight
Ground Clearance	1.42 ft
Height To Top Of Cab	9.08 ft
Tail Swing Radius	7 ft
Length Of Track On Ground	9.08 ft
Width To Outside Of Tracks	8.5 ft
Transport Width	2.53 ft
Undercarriage
Drawbar Pull	24,720 lb
Max Travel Speed	3.4 mph
Shoe Size	24 in
Ground Pressure	4.5 psi
Engine
Engine Model	3064T
Gross Power	94 hp
Net Power	90 hp
Displacement	259 cu in
Bore	4 in
Stroke	5.1 in
Flywheel Power	90 hp
Power Measured @	1,950 rpm
Aspiration	Turbocharged
Eec 80/1269	90 hp
SAE J1349	90 hp
ISO 9249	90 hp
Operational
Fuel Capacity	66 gal
Cooling System Fluid Capacity	4.6 gal
Hydraulic System Fluid Capacity	42.8 gal
Engine Oil Capacity	4.6 gal
Swing Drive Fluid Capacity	0.8 gal
Operating Voltage	24 V
Hydraulic System Relief Valve Pressure	4,340 psi
Hydraulic Pump Flow Capacity	33.5 gpm
Alternator Supplied Amperage	50 amps
Swing Mechanism
Swing Torque	22,830 lb-ft
Swing Speed	12.4 rpm
Buckets
Reference Bucket Capacity	0.8 yd3
Minimum Bucket Capacity	0.4 yd3
Maximum Bucket Capacity	1 yd3
Weights
Operating Weight - Long Undercarriage	29,010 lb
Hydraulic System
Pilot System - Maximum Flow	6.3 gpm
Pilot System - Maximum Pressure	600 psi
Maximum Pressure - Travel	4,980 psi
Maximum Pressure - Swing	3,340 psi
Boom Cylinder - Bore	4.3 in
Boom Cylinder - Stroke	40 in
Stick Cylinder - Bore	4.7 in
Stick Cylinder - Stroke	47.1 in
Bucket Cylinder - Bore	3.9 in
Bucket Cylinder - Stroke	37 in
Maximum Pressure - Implements	4,340 psi
Main Implement System - Maximum Flow (2x)	33.5 gpm
Blade - Maximum Flow	15.5 gpm
Blade System - Maximum Pressure	2,990 psi
Service Refill Capacities
Cooling System	4.6 gal
Final Drive - Each	0.7 gal
Hydraulic Tank	23.8 gal
Hydraulic System - Including Tank	42.8 gal
Engine Oil	4.6 gal
Fuel Tank	66 gal
Swing Drive - Each	0.8 gal
Drive
Maximum Drawbar Pull	25,200 lb
Travel Speed	3.5 mph
Additional specifications
Track Gauge	6.5 ft
Operating Weight	28,970 lb

Source

Compare Cat 311B, 312B, 312B L, 312C, 312C L

Boom/Stick Option (Hex) 1
Specification	311B	312B	312B L	312C	312C L
Max Cutting Height	25.14 ft	27.01 ft	27.01 ft	27.81 ft	27.1 ft
Max Loading Height	17.39 ft	19.23 ft	19.23 ft	20 ft	20 ft
Max Reach Along Ground	23.92 ft	25.56 ft	25.56 ft	26.83 ft	26.83 ft
Max Vertical Wall Digging Depth	13.62 ft	14.54 ft	14.54 ft	16.31 ft	16.33 ft
Max Digging Depth	15.56 ft	16.84 ft	16.84 ft	18.21 ft	18.25 ft

Dimensions and weight
Specification	311B	312B	312B L	312C	312C L
Ground Clearance	1.45 ft	1.45 ft	1.45 ft	1.45 ft	1.42 ft
Height To Top Of Cab	9.06 ft	9.06 ft	9.06 ft	9.06 ft	9.08 ft
Width To Outside Of Tracks	8.17 ft	8.17 ft	8.17 ft	8.5 ft	8.5 ft
Length Of Track On Ground	8.57 ft	9.13 ft	9.98 ft	9.13 ft	9.08 ft
Tail Swing Radius	6.99 ft	6.99 ft	6.99 ft	6.99 ft	7 ft

Undercarriage
Specification	311B	312B	312B L	312C	312C L
Track Gauge	6.53 ft	6.53 ft	6.53 ft	6.53 ft	6.5 ft
Shoe Size	19.69 in	19.69 in	19.69 in	24 in	24 in
Drawbar Pull	20,720 lb	22,930 lb	22,930 lb	24,729 lb	24,720 lb
Ground Pressure	5.51 psi	5.66 psi	5.51 psi	4.79 psi	4.5 psi
Max Travel Speed	3.42 mph	3.42 mph	3.42 mph	3.42 mph	3.4 mph

Engine
Specification	311B	312B	312B L	312C	312C L
Engine Model	3064T	3064T	3064T	3046 T	3064T
Net Power	79 hp	84 hp	84 hp	90 hp	90 hp
Gross Power	85 hp	91 hp	91 hp	94 hp	94 hp
Power Measured @	1,800 rpm	1,900 rpm	1,900 rpm	1,950 rpm	1,950 rpm
Displacement	259 cu in	259 cu in	259 cu in	259.4 cu in	259 cu in
Aspiration	Turbocharged	Turbocharged	Turbocharged	Turbocharged	Turbocharged

Operational
Specification	311B	312B	312B L	312C	312C L
Operating Weight	24,527 lb	27,410 lb	28,010 lb	28,170 lb	28,970 lb
Fuel Capacity	66.1 gal	66.1 gal	66.1 gal	66.1 gal	66 gal
Cooling System Fluid Capacity	4.1 gal	4.1 gal	4.1 gal	4.7 gal	4.6 gal
Hydraulic System Fluid Capacity	41.5 gal	42.8 gal	42.8 gal	42.8 gal	42.8 gal
Engine Oil Capacity	3.5 gal	3.5 gal	3.5 gal	4.7 gal	4.6 gal
Swing Drive Fluid Capacity	0.8 gal	0.8 gal	0.8 gal	0.8 gal	0.8 gal
Alternator Supplied Amperage	50 amps	50 amps	50 amps	55 amps	50 amps
Hydraulic System Relief Valve Pressure	4,980 psi	4,980 psi	4,980 psi	4,980 psi	4,340 psi
Hydraulic Pump Flow Capacity	57.1 gpm	63.5 gpm	63.5 gpm	33.5 gpm	33.5 gpm

Swing Mechanism
Specification	311B	312B	312B L	312C	312C L
Swing Speed	10.8 rpm	12.3 rpm	12 rpm	12.9 rpm	12.4 rpm
Swing Torque	22,422 lb-ft	22,422 lb-ft	22,422 lb-ft	22,496 lb-ft	22,830 lb-ft

Buckets
Specification	311B	312B	312B L	312C	312C L
Reference Bucket Capacity	0.6 yd3	0.6 yd3	0.6 yd3	0.8 yd3	0.8 yd3
Minimum Bucket Capacity	0.5 yd3	0.5 yd3	0.5 yd3	0.4 yd3	0.4 yd3
Maximum Bucket Capacity	1.1 yd3	1.1 yd3	1.1 yd3	1 yd3	1 yd3

More in Cat: 311C–314D LCR, 313–315 GC, 311D LRR: stick choices/tool circuits/rear clearance.

Cat 311B to 312C L specifications

311B to 312C L: owner reports

Sources for this page

Cat 311B to 312C L: Configuration records