All 818 pages of this Kobelco SK25SR, SK30SR, SK35SR Shop Manual PDF cover one family of machines: the short-radius hydraulic excavators that earn their keep in tight quarters. You get full hydraulic pump teardown and rebuild procedures, control valve and pilot valve maintenance standards, slewing and travel motor service, plus complete circuit diagrams with harness connections and component arrangements. A dedicated troubleshooting section walks the engine group, pump group, travel, slewing, and attachment systems fault by fault. Torque the travel unit mounting capscrews to 10.4 kgf·m (75 ft·lbs) and snug the 1/4 PF O-ring fittings to 3.5 kgf·m before you button up the undercarriage. Mini excavators don't forgive guesswork on pilot pressures. Bookmarked by section, so you can jump straight to the system sitting on your bench; opens on any device you carry into the shop.
What's Inside This Kobelco SK25SR, SK30SR, SK35SR Manual
| System | Pages | Key Topics |
|---|---|---|
| Preventive Maintenance | 5 | - |
| Specification | 6-43 | Name of Components, General Dimensions, Specifications and Performance |
| Location and Weight of Components | 44-52 | Location of Components, Weight of Components, Weight of Attachments |
| Maintenance Standards and Test Procedures | 53-66 | Maintenance Standard, Standards for Judging Performance, Test Procedures |
| Working Standards | 67-232 | Name of Components, Specifications and Performance, Type of Shoes, Type of Buckets, Working Ranges of Attachments, Lifting Diagram, Engine Specifications, Engine Performance Curves |
| Operator Control and Engine Control | 233-248 | Operating Lever, Switch Layout, Monitor Panel, Engine Control, Deceleration Control |
| Major Electrical Equipment | 249-266 | Electrical Equipment List, Battery, Alternator, Fuse Box, Sensors, Relays |
| Electric System | 267-293 | Circuit Diagram, Harness Connection, Components Arrangement, Relay Assembly, Cab Harness |
| Troubleshooting | 294-309 | Trouble Diagnostic List, Engine Group, Pump Group, Travel System, Slewing System, Attachment System |
| Hydraulic Pump | 310-363 | Hydraulic Pump Specifications, Construction, Operation, Removal and Installation, Maintenance Standards |
| Control Valve and Pilot Valve | 364-424 | Control Valve Specifications, Relief Valve, Pilot Valve, Removal and Installation, Maintenance Standards |
| Slewing Motor and Travel Motor | 425-599 | Slewing Motor Unit, Travel Motor Unit, Reduction Gear, Parking Brake, Hydraulic Timer |
| Hydraulic Cylinder and Engine Service | 600-818 | Hydraulic Cylinder Construction, Removal and Installation, Engine Service Manual, Fuel Injection Pump, Governor, Turbocharger |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Tightening torque for 1/8 PF screw (O-ring type) | 2.0±0.2 kgf·m | p. 71 |
| Tightening torque for 1/4 PF screw (O-ring type) | 3.5±0.5 kgf·m | p. 71 |
| Tightening torque for socket bolts (5) on hydraulic pump | 9.7±0.5 kgf·m (70±4 ft·lbs) | p. 134 |
| Tightening torque for travel unit mounting capscrews | 10.4 ± 1.0 kgf·m (75 ± 7 ft·lbs) | p. 171 |
| Tightening torque for M12 bolts | 9~11.5kgf·m (65~83ft·lbs) | p. 554 |
| Tightening torque for ring nut (104) | 20 ± 1.0 kgf·m (145 ± 7 ft·lbs) | p. 576 |
| SK25SR | ||
| Travel Motor Reduction Gear Oil Capacity | 600cc | p. 172 |
| SK35SR | ||
| Travel Motor Reduction Gear Oil Capacity | 700cc | p. 172 |
Kobelco SK25SR, SK30SR, SK35SR Common Problems This Manual Covers
Kobelco SK25SR hydraulics weak and slow after selector valve position changed, bucket loses digging power
Verify the selector valve position matches the attachment in use before condemning the pump. Work through the trouble diagnostic list starting on page 298, checking each circuit for slow response. If you disturbed any PF 3/8 O-ring fittings during diagnosis, retorque them to 5.5±0.5 kgf·m (40±4 ft·lbs) per the chart on page 227.
Manual Section: Troubleshooting p. 298One track travels slower than the other, machine veers during straight travel
Drain the travel motor reduction gear and inspect the oil for metal chips or gray powder. Refill to the capacity listed on page 172, which is 600cc for the SK25SR. If the travel unit came off, torque the mounting capscrews to 10.4±1.0 kgf·m (75±7 ft·lbs), the spec on page 171, then test both tracks on flat ground.
Manual Section: Slewing Motor and Travel Motor p. 425Hydraulic pump whines under load, all functions slow, engine speed drops when loaded
Check the hydraulic oil level and inspect the suction line for air leaks; a cavitating pump whines even at low idle. Drain a sample and look for metal chips, since any glitter means internal wear. Follow the pump removal procedure starting on page 310 and torque the M12 socket bolts to 9.7±0.5 kgf·m (70±4 ft·lbs), the spec on page 134.
Manual Section: Hydraulic Pump p. 310Hydraulic fittings seep at the boom and arm lines, oil film appears after a full shift
Clean each suspect joint dry, cycle the boom and arm, and pinpoint the actual seep before wrenching anything. Never overtighten a weeping O-ring joint; replace the O-ring if the fitting already checks at spec. Torque PF 1/2 O-ring joints to 6.5±0.5 kgf·m (47±4 ft·lbs) and PF 1/4 joints to 3.5±0.5 kgf·m, using the chart on page 651.
Manual Section: Working Standards p. 651Frequently Asked Questions
What are the replacement specifications for the hydraulic oil tank filler cap O-ring?
The O-ring for the hydraulic oil tank filler cap is listed as part number 11 (Packing) in the component parts table for the tank assembly. The quantity required is 1. p. 127
What is the tightening torque for the cylinder head bolts on a 3TNE74 engine?
The tightening torque for the cylinder head bolts on a 3TNE74 engine is 6.0-6.5 kgf-m. p. 765
What is the standard valve clearance for the intake and exhaust valves on the engine?
The standard valve clearance for all engine models is 0.15-0.25 mm. p. 717
What is the standard V-belt tension for the engine?
The V-belt tension is considered acceptable if the deflection at the center of the belt between the alternator and cooling water pump is 10-15 mm when pressed with a finger. p. 718
What is the standard compression pressure for the 3TNE82A engine?
The standard compression pressure for the 3TNE82A engine is 31 +/- 1 kgf/cm2 at 250 rpm. p. 715
Is this Kobelco SK25SR manual a PDF I download?
Instant PDF download. You get the full 818-page scanned Shop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
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Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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