Written specifically for the TKB-70 hydraulic breaker, this 20-page Takeuchi TKB-70 service manual PDF takes you from chisel exchange and breaker mounting through full disassembly and accumulator assembly. A section drawing splits the breaker into back head, accumulator, cylinder, valve, piston and front groups, so you see how each part sits before teardown. The troubleshooting chart covers weak, irregular or absent hammering, excessive hose vibration, high oil temperature and oil leakage, and a pipe fitting chart lays out the bracket, bracket pin, quick coupling and change-over valve. Set the carrier to supply 15 to 32 l/min of oil flow at a working pressure of 90 to 110 kg/cm². For the accumulator gas pressure check under maintenance and inspection, your target is 35 to 40 kg/cm². Bookmarks reach any section in one click. Type a term such as grease or bolts into the text search and you land on the matching page directly.
What's Inside This Takeuchi TKB-70 Manual
| System | Pages | Key Topics |
|---|---|---|
| Parts List. Section Drawing | 4-5 | Back Head Gr., Accumulator Gr., Cylinder Gr., Valve Gr., Piston Gr., Front Gr. |
| Specifications | 6-8 | Overall Weight, Overall Length, Working Pressure, Oil Flow, Number of Blows, Chisel Diameter |
| Exchange of Chisel | 9 | Removing the Chisel, Installing the Chisel |
| Installation and Removal of Breaker | 10 | Removing the Breaker, Installing the Breaker |
| Maintenance and Inspection | 11-14 | Inspection Details, Bolts, Hydraulic Oil, Oil Leakage, Hydraulic Hose, Grease, Accumulator Gas Pressure |
| Troubleshooting | 15 | Weak Hammering, No Hammering, Irregular Hammering, Excessive Vibration of Hoses, Excessive High Temperature of Oil, Oil Leakage |
| Assembly and Disassembly of Breaker | 16-18 | Cautions, Disassembly, Assembling the Accumulator |
| Pipe Fitting Chart | 19-20 | Hydraulic Breaker, Chisel, Bracket, Bracket Pin, Quick Coupling, Change-Over Valve |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Working pressure | 90-110 kg/cm² | p. 6 |
| Accumulator gas pressure | 35-40 kg/cm² | p. 13 |
| Overall weight (without chisel) | 91kg | p. 6 |
| Oil flow | 15-32l/min | p. 6 |
| Chisel diameter | 45mm | p. 6 |
Takeuchi TKB-70 Common Problems This Manual Covers
Takeuchi TKB-70 hydraulic breaker engaged against rock but hammering stays weak with poor striking force
Check engine speed first and adjust the throttle lever, then confirm the breaker lever shifts fully and tighten any loose link. Reset the relief set pressure, checking working pressure against 90-110 kg/cm² on page 6. Check accumulator gas against 35-40 kg/cm² following page 13, charging with nitrogen only; the manual warns other gases are dangerous. Inspect the chisel for free vertical movement.
Manual Section: Troubleshooting p. 15Breaker will not hammer at all when the breaker pedal is depressed or lever shifted
Inspect the pedal link first and repair any poor link, since a shift valve that does not work stops striking completely. If the link is good, suspect a poor relief valve. Adjust the hydraulic pressure, checking it against the 90-110 kg/cm² working pressure on page 6. Replace the relief valve if adjustment does not bring hammering back.
Manual Section: Troubleshooting p. 15Irregular hammering with inconsistent blows while the chisel is held on the rock
Inspect the chisel for free vertical movement first, because a stuck chisel throws off the striking rhythm. Pull it following the chisel exchange steps on page 9, then fully grease the shank with molybdenum disulfide grease before reinstalling. If the chisel moves freely, treat it as a poor relief valve and replace the defective spring in the valve per page 15.
Manual Section: Troubleshooting p. 15Breaker hydraulic hoses at the IN and OUT lines showing excessive vibration during hammering
Stop operating and examine the accumulator, as page 8 directs after unusual hose vibration. Low accumulator gas is the listed cause. Measure sealed gas with the gas charger following page 13 and replenish to 35-40 kg/cm². Use nitrogen only; the manual warns other gases are dangerous. Low gas pressure also wears hoses out early, so inspect them for damage.
Manual Section: Troubleshooting p. 15Breaker hydraulic oil running excessively hot and temperature climbing above 80°C during long hammering sessions
Check oil temperature and stop operation above 80°C. Resume only after the oil cools, because seals come off past that point (page 8). Clean the oil return circuit if blocked. Make sure oil temperature is low before removing any hose, since hot oil causes burns (page 8). Adjust the engine throttle lever to cut excessive oil flow; rated flow is 15-32 l/min on page 6. Limit hammering at one point to one minute.
Manual Section: Troubleshooting p. 15Hydraulic oil leaking from the cylinder joints, accumulator, Front Head or hose couplings
Inspect where the oil exits: replace O Ring VV54-20-6001 at the Back Head and Cylinder joint, VV54-20-6501 or TS17-10-0030 at the Cylinder and Accumulator joint, and the lip seals at the Front Head, per page 15. Before disassembly, let oil cool to avoid burns and wait until accumulator gas reads 0 kg/cm², since page 8 warns parts can fly out. Fit new O Rings and seals.
Manual Section: Troubleshooting p. 15Frequently Asked Questions
What are the torque specifications for a Takeuchi TKB-70?
The manual provides specific torque settings for various components. For example, the through bolt requires 20 kg-m, the accumulator plug requires 5 kg-m, and the fixing bolt for the breaker and bracket requires 20 kg-m. p. 11
What are the replacement specifications for the working tool or chisel on the Takeuchi TKB-70?
The TKB-70 uses a 45mm diameter chisel. There are four types available: Moil point (TS17-99-0010), Straight type (TS17-99-0020), Flat X type (TS17-99-0030), and Flat Y type (TS17-99-0040). p. 6
What is the required accumulator gas pressure for the TKB-70?
The sealed gas pressure for the accumulator is 40 kg/cm². When checking or replenishing, the proper pressure range is 35-40 kg/cm². p. 13
What is the recommended service interval for replacing hydraulic oil on the Takeuchi TKB-70?
The hydraulic oil should be replaced every 600 hours of operation. Additionally, undercarriage filters must be replaced every 100 hours. p. 12
What is the maximum operating temperature for the hydraulic breaker?
Operation must be stopped if the temperature rises above 80°C. Continued use at higher temperatures will cause the seals to fail. p. 8
How is this Takeuchi TKB-70 Service Manual delivered?
This is a 20-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print pages of this Takeuchi TKB-70 manual for my own shop?
Yes. Many buyers print one chapter at a time for their own shop and keep the rest on a tablet.
