Part of the JCB Operator Manuals.
Need the factory operating instructions for your tracked excavator? This 186-page JCB JS120 Operator Manual PDF (OEM #9821/2100) details every cab control, daily check, and scheduled service interval. Find the troubleshooting section covering engine fault messages and hydraulic pump issues, along with procedures for routine upkeep without second-guessing. Replace the main fuel hoses every 4000 hours or every 2 years, whichever comes first, and keep the battery electrolyte level exactly 15 mm (0.6 in) above the internal plates. You cannot afford unexpected downtime from missed maintenance. Grab this bookmarked file on your tablet, walk out to the job site, and get back to work.
What's Inside This Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Notices | 9-10 | Important Information, Operator Manual, Safety Warnings |
| Introduction | 11-32 | About This Manual, Machine Description, Component Location, Safety Check List, Safety Labels, Identifying Your Machine |
| Operation | 33-94 | Before Entering the Cab, Entering and Leaving the Cab (Standard Cab Machines) |
| Routine Maintenance | 95-168 | Service Requirements (Introduction, Owner/Operator Support, Service/Maintenance Agreements, Fit for Purpose Tests for Lifting Equipment, Obtaining Replacement Parts) |
| Optional Attachments | 169-174 | Attachments for Your Machine, Connecting/Disconnecting Hydraulic Hoses (Introduction), Hydraulic Rockbreaker (Preparation, Operation and Maintenance) |
| Specifications | 175-186 | Static Dimensions (JS120), Dig Depth Chart (JS120), Shipping Weight, Travel Speeds |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic ram seals replacement | Replace hydraulic ram seals(1) | p. 173 |
| Battery Electrolyte Level | 15 mm (0.6 in) above the plates | p. 126 |
| Tighten terminal clamps | Tighten terminal clamps | p. 100 |
| Fuel Hose (Fuel Tank - Engine) replacement interval | Every 2 years or every 4000 hours, whichever comes first | p. 108 |
| Fuel Hose (Fuel Filter - Injection Pump) replacement interval | Every 2 years or every 4000 hours, whichever comes first | p. 108 |
| Track sag (Firm / Hard ground) | 35-40 | p. 161 |
| Track sag (Soft / Muddy ground) | 60-70 | p. 161 |
| Remedy for Foreign matter caught on control valve spool | Wash the control valve(1) | p. 172 |
| Remedy for Valve sticking | Repair or replace valve assembly(1) | p. 172 |
| Remedy for Damaged hydraulic ram seals (attachment sinks down) | Replace hydraulic ram seals(1) | p. 173 |
| Remedy for Damaged hydraulic ram, cylinder (attachment sinks down) | Replace hydraulic ram/cylinder or the assembly(1) | p. 173 |
| Rams - Chrome Condition check interval | Check | p. 103 |
