Machine models

Komatsu SK815-5, SK820-5 and SK1020-5: circuits and attachment limits

Identify the auxiliary circuit before choosing a flow figure

The European SK815-5 sheet distinguishes the normal auxiliary circuit from Super Flow. The base circuit has proportional pedal control and can be held at maximum flow. Super Flow adds the drain and electrical connections needed by its attachment arrangement.

A second circuit is a further distinction. The sheet gives one pair of flow ratings for using the circuits separately and another pair for simultaneous operation. Adding the two separate maximums would describe a combination the sheet does not promise.

Check the valve arrangement and the attachment's simultaneous demands.

The SK815 document also separates naturally aspirated and turbo engine ratings. Its European rating lines are not identical to every American reference entry for the same model name. The brochure, rating standard and engine suffix belong together when comparing an advertised horsepower figure.

Cab, hood and footboard tilt together for service access. The optional equipment list separately names a backhoe preparation, rear hydraulic stabiliser and modular rear counterweight. A loader offered with one of those items is not necessarily equipped with the others.

Source: Original European SK815-5 sheet, November 2003, circuit and equipment arrangements.

The larger SK1020 has attachment-dependent lifting figures

Komatsu's American SK1020-5 brochure gives different breakout forces for short-lip and long-lip buckets. Its counterweighted bucket arrangement and counterweighted pallet-fork arrangement have different operating capacities too. The bucket's load rating must not be reused as a fork rating.

The standard auxiliary flow and optional Super Flow maximum are separate entries. A reference showing the larger figure does not establish that a used machine has that option. The brochure identifies the optional four-element valve arrangement, alongside the extra auxiliary circuit.

Control choice changes pedal use. PPC joysticks operate travel and the loader; an optional pattern-change valve changes how the joystick functions are divided. The brochure excludes the foot accelerator from its hand-and-foot control pattern.

Establish the installed layout before expecting that pedal to behave like another machine's throttle.

Source: Original KUSS153-01, October 2003, controls and bucket/fork conditions.

A service change is smaller than an empty-system filling

The SK820-5 Turbo maintenance table distinguishes initial filling from an oil change for the combined hydraulic and hydrostatic system. Its final-transmission case quantity is per case. Keeping those headings prevents a complete-system capacity from being used as a routine refill, or a combined chain-case figure from being poured into each side.

Source: Original SK820-5 Turbo maintenance table, section 4.3, printed page 159.

Earlier reference entries and original manufacturer corrections
Model and fieldEarlier entryManufacturer figure and scopeSource
SK815-5 Chain Box Fluid Capacity - Each Side8.2 gal15.5 +15.5 L, separatelyfilledchaincases, originalEuropeanNovember2003sheetOriginal document
SK820-5 Chain Box Fluid Capacity - Each Side8.2 gal31.0 L (8.0 US gal) combinedchaincases, KUSS154-02;WEAMtable15.5L eachcaseOriginal document
SK1020-5 Chain Box Fluid Capacity - Each Side8.5 gal32.0 L (8.3 US gal), combinedchaincases, KUSS153-01Original document
SK820-5 Net Power51.8 hp40.3 kW (54 HP) at2800rpm, SAEJ1349net, KUSS154-02July2007Original document
SK820-5 Gross Power54 hp40.3 kW (54 HP), explicitlySAEJ1349net inKUSS154-02; earliergrosslabel invalidOriginal document
SK820-5 Bucket Capacity0.8 yd30.43 m3 (0.56 yd3),1730mm68inlonglipbucket, KUSS154-02Original document
SK1020-5 Bucket Capacity0.7 yd30.47 m3 (0.61 yd3),1880mm74inlonglipbucket, KUSS153-01Original document
SK1020-5 Tire Size10-16.5 8PR12.00 x16.5 8PR, KUSS153-01dimension/performanceconditions; optional12-16.5 10PRdifferentOriginal document
SK1020-5 Pump Flow Capacity34.4 gpm80 L/min (21 gpm) standardauxiliary;130 L/min (34 gpm) optionalSuperFlow, KUSS153-01Original document
SK815-5 Hydraulic System Fluid Capacity10.1 gal38 L, originalEuropeanNovember2003hydraulicsystemservicecapacityOriginal document
SK820-5 Hydraulic System Fluid Capacity10.1 gal38.0 L (10.0 US gal), KUSS154-02servicecapacity; separateWEAMinitial39L/change27LOriginal document
SK1020-5 Hydraulic System Fluid Capacity13.3 gal50.0 L (13.0 US gal), KUSS153-01servicecapacityOriginal document
SK815-5 Tipping Angle3086.5 degrees1400 kg, ISO8313 tipping load, originalEuropeanSK815sheet; not an angleOriginal document
SK820-5 Tipping Angle3807.4 degrees1727 kg (3800 lb), ISO8313 unballastedbucket tipping load, KUSS154-02; not an angleOriginal document
SK1020-5 Tipping Angle3999.2 degrees1814 kg (4000 lb), ISO8313 unballastedbucket tipping load, KUSS153-01; not an angleOriginal document
Entries in this reference
Listing-entry count
3
Short answer

Komatsu SK815-5, SK820-5 and SK1020-5: circuits and attachment limits: wheeled compact loaders.

Selected configuration figures
ConfigurationDocumented field and quantity
SK815-5
Net Power
54 hp
Pump Flow Capacity
16.4 gpm
SK820-5
Net Power
40.3 kW (54 HP) at2800rpm, SAEJ1349net, KUSS154-02July2007 [source]
Operational Weight
6,482 lb
SK1020-5
Net Power
70 hp
Operational Weight
7,573 lb
SK815-5, SK820-5, and SK1020-5 specification matrix — Listing labels reported by the source
Publisher nameSource guideListing-entry countLabels named by the source
KomatsuSK815-5, SK820-5, and SK1020-53SK815-5, SK820-5, and SK1020-5
Dimensions and weight
SpecificationSK815-5SK820-5SK1020-5
Length With Bucket11.39 ft11.42 ft12.09 ft
Ground Clearance8.27 in8.27 in8.27 in
Height To Top Of Cab6.4 ft6.57 ft6.83 ft
Wheelbase3.45 ft3.45 ft3.81 ft
Clearance At Max Lift And Dump6.91 ft7.19 ft7.5 ft
Reach At Max Lift And Dump24.22 in25.99 in27.17 in
Turning Radius From Center - Inc Bucket78.98 in79.38 in89.18 in
Turning Radius From Center - Machine Rear64.77 in65.63 in64.97 in
SpecificationSK815-5
Length W/O Bucket6.73 ft
SpecificationSK820-5SK1020-5
Width Over Tires5.44 ft5.68 ft
Engine
SpecificationSK815-5SK820-5SK1020-5
Number Of Cylinders444
Engine ModelS4D84E-1FDS4D84E-1FD4D98E-1FD
Net Power54 hp40.3 kW (54 HP) at2800rpm, SAEJ1349net, KUSS154-02July200770 hp
Power Measured @2,800 rpm2,800 rpm2,500 rpm
Aspirationturbochargedturbochargednatural
SpecificationSK820-5
SAEJ1349 Net Rating (July2007)40.3 kW (54 HP), explicitlySAEJ1349net inKUSS154-02; earliergrosslabel invalid
SpecificationSK820-5SK1020-5
Displacement122.1 cu in207.5 cu in
Operational
SpecificationSK815-5SK820-5SK1020-5
Fuel Capacity14.1 gal14.1 gal19.3 gal
Cooling System Fluid Capacity2.2 gal2.2 gal2.2 gal
Engine Oil Fluid Capacity2.2 gal2.2 gal3.4 gal
Hydraulic System Fluid Capacity38 L, originalEuropeanNovember2003hydraulicsystemservicecapacity38.0 L (10.0 US gal), KUSS154-02servicecapacity; separateWEAMinitial39L/change27L50.0 L (13.0 US gal), KUSS153-01servicecapacity
Max Speed10 mph10 mph10 mph
Chain Case Refill Capacity (scope in cell)15.5 +15.5 L, separatelyfilledchaincases, originalEuropeanNovember2003sheet31.0 L (8.0 US gal) combinedchaincases, KUSS154-02;WEAMtable15.5L eachcase32.0 L (8.3 US gal), combinedchaincases, KUSS153-01
Operating Speed6.6 mph6.6 mph6.3 mph
Tire Size10-16.5 8PR10-16.5 8PR12.00 x16.5 8PR, KUSS153-01dimension/performanceconditions; optional12-16.5 10PRdifferent
Operating Voltage12 V12 V12 V
Alternator Supplied Amperage40 amps40 amps40 amps
SpecificationSK820-5SK1020-5
Operational Weight6,482 lb7,573 lb
Loader
SpecificationSK815-5SK820-5SK1020-5
Breakout Force3,356 lb3,530 lb4,277 lb
Operating Load Rating1,554 lb1,905 lb2,000 lb
Tipping Load Manufacturer Scope1400 kg, ISO8313 tipping load, originalEuropeanSK815sheet; not an angle1727 kg (3800 lb), ISO8313 unballastedbucket tipping load, KUSS154-02; not an angle1814 kg (4000 lb), ISO8313 unballastedbucket tipping load, KUSS153-01; not an angle
Bucket Capacity0.6 yd30.43 m3 (0.56 yd3),1730mm68inlonglipbucket, KUSS154-020.47 m3 (0.61 yd3),1880mm74inlonglipbucket, KUSS153-01
Hydraulic
SpecificationSK815-5SK820-5SK1020-5
Pump TypeKomatsu GearKomatsu GearKomatsu closed load sensing system
Measurement and equipment basis (specified in each cell)Pump Flow Capacity: 16.4 gpmPump Flow Capacity: 15.9 gpmAuxiliary Flow Standard And Optional: 80 L/min (21 gpm) standardauxiliary;130 L/min (34 gpm) optionalSuperFlow, KUSS153-01
Relief Valve Pressure2,770 psi3,046 psi3,046 psi
Variants — Source comparison annotation
Source guideDiffering-field count reported
SK815-5, SK820-5, and SK1020-528
Ratios
FigureSK820-5SK1020-5
Engine horsepower per 1,000 lb of weight8.09.2
Reference calculations using the earlier specification entries
FigureSK815-5SK820-5SK1020-5
Pump flow per engine horsepower0.30 gpm0.31 gpm0.49 gpm
Fuel tank per engine horsepower0.26 gal0.27 gal0.28 gal

Komatsu SK815-5, SK820-5 and SK1020-5: circuits and attachment limits: wheeled compact loader

SK815-5, SK820-5, and SK1020-5: forum references — Forum-title search
Forum indexEquipment class queriedNames in the searchMatching titles
Heavy Equipment Forumswheeled compact loaderKomatsu and the SK815, SK1020 line that the SK815-5, SK820-5, SK1020-5 belongs to (no title names the exact model). That is too few titles to say what owners mostly ask about, so the most recent are listed instead5
SK815-5, SK820-5, and SK1020-5: dated market and recall observations — Dated listing search
DateListing indexEquipment classNames queriedResult
2026-09-24MachineryTrader (machinerytrader.com)wheeled compact loaderSK815-5, SK820-5, SK1020-5No matching offers in this snapshot
Dated CPSC search
DateDatabaseNames queriedResult
2026-09-24U.S. Consumer Product Safety CommissionKomatsu; SK815-5, SK820-5, SK1020-5No matching recall in the stated search

Sources for this page

Evidence classDocument, classification and recorded date
Reference site
Reference site
Reference site
Forum threads
Federal agency data
Recorded observations — Classification in the linked listing
GuideAs-listed machine class
Komatsu SK815-5, SK820-5 and SK1020-5: circuits and attachment limitswheeled compact loader
Forum-title snapshot
Observation fieldRecorded value
Title count5
Forum indexesHeavy Equipment Forums
Search wordingthe SK815-5, SK820-5, and SK1020-5 wheeled compact loader
Latest title quoted by the referenceKomatsu Sk815 Turbo With Super Flow Weak Bucket Hydraulics

Komatsu SK815-5, SK820-5 and SK1020-5: circuits and attachment limits: Configuration records

SK815-5
SpecificationSource figure
Dimensions and weight
Length With Bucket11.39 ft
Ground Clearance8.27 in
Height To Top Of Cab6.4 ft
Wheelbase3.45 ft
Clearance At Max Lift And Dump6.91 ft
Reach At Max Lift And Dump24.22 in
Turning Radius From Center - Machine Rear64.77 in
Turning Radius From Center - Inc Bucket78.98 in
Length W/O Bucket6.73 ft
Engine
Number Of Cylinders4
Engine ModelS4D84E-1FD
Net Power54 hp
Power Measured @2,800 rpm
Aspirationturbocharged
Operational
Fuel Capacity14.1 gal
Engine Oil Fluid Capacity2.2 gal
Max Speed10 mph
Hydraulic System Fluid Capacity38 L, originalEuropeanNovember2003hydraulicsystemservicecapacity [source]
Tire Size10-16.5 8PR
Operating Voltage12 V
Alternator Supplied Amperage40 amps
Cooling System Fluid Capacity2.2 gal
Operating Speed6.6 mph
Loader
Breakout Force3,356 lb
Operating Load Rating1,554 lb
Hydraulic
Pump TypeKomatsu Gear
Pump Flow Capacity16.4 gpm
Relief Valve Pressure2,770 psi
Additional specifications
Chain Case Refill Capacity (scope in cell)15.5 +15.5 L, separatelyfilledchaincases, originalEuropeanNovember2003sheet [source] [source]
Bucket Capacity0.6 yd3
Tipping Load Manufacturer Scope1400 kg, ISO8313 tippingload; standardEuropeanbucket arrangement [source]
EuropeanNovember2003 Circuit And Rating ScopeEuropeanSAEnet34.7kW47.2HPnatural/38.9kW52.2HPturbo, notUS54HPratingline. Base62L/min191bar;SuperFlow100L/min optional;simultaneousfirst/secondcircuits90/10L/min versusseparate100/62. PPCpedalauxiliary, cab/hood/footboardtilt. Standard2630kgincludes80kgoperator/fullfuel/bucket. Chain15.5+15.5Lseparatehyd38L. [source]

Source

SK820-5
SpecificationSource figure
Dimensions and weight
Length With Bucket11.42 ft
Width Over Tires5.44 ft
Ground Clearance8.27 in
Height To Top Of Cab6.57 ft
Wheelbase3.45 ft
Clearance At Max Lift And Dump7.19 ft
Reach At Max Lift And Dump25.99 in
Turning Radius From Center - Machine Rear65.63 in
Turning Radius From Center - Inc Bucket79.38 in
Engine
Number Of Cylinders4
Engine ModelS4D84E-1FD
Net Power40.3 kW (54 HP) at2800rpm, SAEJ1349net, KUSS154-02July2007 [source]
Power Measured @2,800 rpm
Displacement122.1 cu in
Aspirationturbocharged
Operational
Operational Weight6,482 lb
Fuel Capacity14.1 gal
Engine Oil Fluid Capacity2.2 gal
Max Speed10 mph
Hydraulic System Fluid Capacity38.0 L (10.0 US gal), KUSS154-02servicecapacity; separateWEAMinitial39L/change27L [source]
Tire Size10-16.5 8PR
Operating Voltage12 V
Alternator Supplied Amperage40 amps
Cooling System Fluid Capacity2.2 gal
Operating Speed6.6 mph
Loader
Breakout Force3,530 lb
Operating Load Rating1,905 lb
Hydraulic
Pump TypeKomatsu Gear
Pump Flow Capacity15.9 gpm
Relief Valve Pressure3,046 psi
Additional specifications
SAEJ1349 Net Rating (July2007)40.3 kW (54 HP), explicitlySAEJ1349net inKUSS154-02; earliergrosslabel invalid [source] [source]
Chain Case Refill Capacity (scope in cell)31.0 L (8.0 US gal) combinedchaincases, KUSS154-02;WEAMtable15.5L eachcase [source] [source]
Bucket Capacity0.43 m3 (0.56 yd3),1730mm68inlonglipbucket, KUSS154-02 [source]
Tipping Load Manufacturer Scope1727 kg (3800 lb), ISO8313 bucket/no rearcounterweight [source]
July2007 Bucket Circuit And Refill ScopeKUSS154-02:54HP40.3kWSAEnet2800rpm. Base60L/min16gpm versusSuperFlow100L26gpm. Tip1727kg3800lb/ROC864kg1900lbwithoutballast;126kgballastbucket955kg2100lb;fork650kg1430lbseparate. Standard2940kg6480lb. Bucket0.43m3.56yd3. Chain31L8USgalcombined, noteachside. Sourcefeature/technicalbreakoutfiguresdiffer;usebucketcondition. [source]

Source

SK1020-5
SpecificationSource figure
Dimensions and weight
Length With Bucket12.09 ft
Width Over Tires5.68 ft
Ground Clearance8.27 in
Height To Top Of Cab6.83 ft
Wheelbase3.81 ft
Clearance At Max Lift And Dump7.5 ft
Reach At Max Lift And Dump27.17 in
Turning Radius From Center - Machine Rear64.97 in
Turning Radius From Center - Inc Bucket89.18 in
Engine
Number Of Cylinders4
Engine Model4D98E-1FD
Net Power70 hp
Power Measured @2,500 rpm
Displacement207.5 cu in
Aspirationnatural
Operational
Operational Weight7,573 lb
Fuel Capacity19.3 gal
Engine Oil Fluid Capacity3.4 gal
Max Speed10 mph
Hydraulic System Fluid Capacity50.0 L (13.0 US gal), KUSS153-01servicecapacity [source]
Tire Size12.00 x16.5 8PR, KUSS153-01dimension/performanceconditions; optional12-16.5 10PRdifferent [source]
Operating Voltage12 V
Alternator Supplied Amperage40 amps
Cooling System Fluid Capacity2.2 gal
Operating Speed6.3 mph
Loader
Breakout Force4,277 lb
Operating Load Rating2,000 lb
Hydraulic
Pump TypeKomatsu closed load sensing system
Relief Valve Pressure3,046 psi
Additional specifications
Chain Case Refill Capacity (scope in cell)32.0 L (8.3 US gal), combinedchaincases, KUSS153-01 [source] [source]
Bucket Capacity0.47 m3 (0.61 yd3),1880mm74inlonglipbucket, KUSS153-01 [source]
Auxiliary Flow Standard And Optional80 L/min (21 gpm) standardauxiliary;130 L/min (34 gpm) optionalSuperFlow, KUSS153-01 [source] [source]
Tipping Load Manufacturer Scope1814 kg (4000 lb), ISO8313 bucket/no rearcounterweight [source]
October2003 Attachment ScopeKUSS153-01:SAEnet52.2kW70HPnatural/61.9kW83HPturbo. Standard80L/min21gpm/optional130L34gpmauxiliary. Shortlipbreakout2290kg5038lb versuslonglip1940kg4279lb. No-ballastbucket907kg2000lb;120kgcounterweightbucket998kg2200lb/fork655kg1440lb. Threeequipmentcolumns. Chain32L8.3USgalcombined. [source]

Source

Compare Komatsu SK815-5, SK820-5, SK1020-5
Dimensions and weight
SpecificationSK815-5SK820-5SK1020-5
Length With Bucket11.39 ft11.42 ft12.09 ft
Ground Clearance8.27 in8.27 in8.27 in
Height To Top Of Cab6.4 ft6.57 ft6.83 ft
Wheelbase3.45 ft3.45 ft3.81 ft
Clearance At Max Lift And Dump6.91 ft7.19 ft7.5 ft
Reach At Max Lift And Dump24.22 in25.99 in27.17 in
Turning Radius From Center - Inc Bucket78.98 in79.38 in89.18 in
Turning Radius From Center - Machine Rear64.77 in65.63 in64.97 in
Engine
SpecificationSK815-5SK820-5SK1020-5
Number Of Cylinders444
Engine ModelS4D84E-1FDS4D84E-1FD4D98E-1FD
Net Power54 hp40.3 kW (54 HP) at2800rpm, SAEJ1349net, KUSS154-02July2007 [source]70 hp
Power Measured @2,800 rpm2,800 rpm2,500 rpm
Aspirationturbochargedturbochargednatural
Operational
SpecificationSK815-5SK820-5SK1020-5
Fuel Capacity14.1 gal14.1 gal19.3 gal
Cooling System Fluid Capacity2.2 gal2.2 gal2.2 gal
Engine Oil Fluid Capacity2.2 gal2.2 gal3.4 gal
Hydraulic System Fluid Capacity38 L, originalEuropeanNovember2003hydraulicsystemservicecapacity [source]38.0 L (10.0 US gal), KUSS154-02servicecapacity; separateWEAMinitial39L/change27L [source]50.0 L (13.0 US gal), KUSS153-01servicecapacity [source]
Max Speed10 mph10 mph10 mph
Measurement and equipment basis (specified in each cell)15.5 +15.5 L, separatelyfilledchaincases, originalEuropeanNovember2003sheet [source] [source]31.0 L (8.0 US gal) combinedchaincases, KUSS154-02;WEAMtable15.5L eachcase [source] [source]32.0 L (8.3 US gal), combinedchaincases, KUSS153-01 [source] [source]
Operating Speed6.6 mph6.6 mph6.3 mph
Tire Size10-16.5 8PR10-16.5 8PR12.00 x16.5 8PR, KUSS153-01dimension/performanceconditions; optional12-16.5 10PRdifferent [source]
Operating Voltage12 V12 V12 V
Alternator Supplied Amperage40 amps40 amps40 amps
Loader
SpecificationSK815-5SK820-5SK1020-5
Breakout Force3,356 lb3,530 lb4,277 lb
Operating Load Rating1,554 lb1,905 lb2,000 lb
Bucket Capacity0.6 yd30.43 m3 (0.56 yd3),1730mm68inlonglipbucket, KUSS154-02 [source]0.47 m3 (0.61 yd3),1880mm74inlonglipbucket, KUSS153-01 [source]
Hydraulic
SpecificationSK815-5SK820-5SK1020-5
Pump TypeKomatsu GearKomatsu GearKomatsu closed load sensing system
Measurement and equipment basis (specified in each cell)16.4 gpm15.9 gpm80 L/min (21 gpm) standardauxiliary;130 L/min (34 gpm) optionalSuperFlow, KUSS153-01 [source] [source]
Relief Valve Pressure2,770 psi3,046 psi3,046 psi

More in Komatsu: SK09J-2, SK04J-2/SK05J-2: narrow access/attachment choices, SK1026-5: standard versus Super Flow/attachment ratings.