Skip to content
Menu
OBD2 Scanner Blog
  • Home
  • Car Diagnostic Tool
    • MB Star Diagnosis
    • BMW Diagnostic Tool
    • GM Tech2
    • Volvo Vocom Interface
  • OBD2 Code Scanner
    • VXDIAG
  • Tech Support
OBD2 Scanner Blog

How to Relieve Hydraulic Pressure in Hydraulic Circuits on CAT 312D2 and 313D2 Excavators

Posted on December 8, 2024 by VCDS

Diagzone Xdiag Subscription Renew, LAUNCH LTR-01 RF Sensor, Thinkdiag Renew , Scania SDP3 Installation

How to Relieve Hydraulic Pressure in Hydraulic Circuits on CAT 312D2 and 313D2 Excavators

Procedure for Relieving Pressure:

Before performing any maintenance on a hydraulic circuit, it’s essential to relieve the hydraulic pressure to ensure safety. Always relieve the pressure before disconnecting or removing hydraulic lines. Follow these steps to safely relieve hydraulic pressure in the following circuits:

Boom hydraulic circuit
Stick hydraulic circuit
Bucket hydraulic circuit
Swing hydraulic circuit
Travel hydraulic circuit
Attachment hydraulic circuit (if equipped)
Pilot hydraulic circuit
Return hydraulic circuit

Warning:

Hot oil or hydraulic pressure can cause serious injury. After shutting off the engine, the hydraulic system may still retain pressure. Failure to relieve this pressure before maintenance can result in personal injury. Ensure all tools are lowered to the ground, and the hydraulic fluid is cool before opening any hydraulic components.

Note:

Ensure proper fluid disposal when inspecting, maintaining, or repairing the system. Use appropriate tools and containers to collect fluids, as specified in Cat’s Dealer Service Tool Catalog (NENG2500), and dispose of them according to local regulations.

How to Relieve Hydraulic Pressure in Hydraulic Circuits on CAT 312D2 and 313D2 Excavators

Best Quality CAT Caterpillar ET 2024A 2019C Diagnostic Adapter III Cat Communication Adapter 3 (Real Caterpillar ET3 Adapter 3)

Steps for Relieving Hydraulic Pressure:

Park the Machine: Ensure the machine is on a level surface.
Position Boom and Bucket: Fully retract the boom cylinder rods and position the bucket parallel to the ground. Lower the boom until the bucket is level with the ground.
Shut Off the Engine: Turn off the engine to stop the hydraulic system.
Turn on the Engine Switch: Turn the engine start switch to the ON position without starting the engine.
Unlock the Hydraulic Control Lever: Move the hydraulic start control lever to the unlocked position.
Move the Control Lever or Pedal: For the specific hydraulic circuit you need to maintain, move the corresponding control lever or pedal to the full position. This releases pressure in that particular circuit, as well as in the pilot hydraulic circuit.

If necessary, activate the service switch for the specific circuit.

Lock the Control Lever: Return the hydraulic start lever to the locked position.
Start the Engine: Start the engine again, ensuring no levers, pedals, or switches are moved.
Unlock the Control Lever: Unlock the hydraulic start control lever, but do not move any controls from the neutral position.
Lock the Control Lever Again: Return the hydraulic start lever to the locked position.
Stop the Engine: Turn off the engine once more.
Repeat for Other Circuits: Repeat steps 4 through 11 for any additional hydraulic circuits requiring maintenance.
Lock the Control Lever: Once pressure is relieved from all necessary circuits, move the hydraulic start lever to the locked position.
Turn Off the Engine: Turn the engine start switch to the OFF position.
Loosen the Hydraulic Tank Filler Plug: Slowly loosen the hydraulic tank filler plug for at least 45 seconds to relieve any remaining pressure in the return hydraulic circuit.
Tighten the Filler Plug: Re-tighten the hydraulic tank filler plug to the specified torque.

Following these steps ensures the hydraulic pressure is fully relieved, allowing safe removal or disconnection of hydraulic components for maintenance.

Related posts:

How to Change Injectors on a C15 Cat Step-by-Step Guide
Guide to Disassembling and Assembling the 3054C Engine for Caterpillar 312D2 and 313D2 Excavators
Troubleshooting SPN 970 – FMI 2 (Remote Emergency Stop Fault, Intermittent, or Malfunctioning)
Software Configuration Guide: Crushing Transmission TH55

How useful was this post?

Click on a star to rate it!

Average rating / 5. Vote count:

This Post: How to Relieve Hydraulic Pressure in Hydraulic Circuits on CAT 312D2 and 313D2 Excavators From ChinaOBD2 Official Blog
Please keep this link if you copy the post!

Post navigation

Prev: Prev: How to Code Mercedes Transmission for P07B700 Using Autel Ultra Lite
Next: Next: Perkins 1106D E362 Generation Engine Overspeed Error

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recent Posts

  • Yanhua Module 38 Update BMW BDC2 Reflash and Replace Functions
  • Vapon Update BDC2 IMMO Module Data Erase
  • How to Replace U17 and L8 Components for OBDSTAR G3 Startup Failure?
  • Alientech Kess3 Adds Master TCU OBD-Bench-Boot Protocol
  • Scania Truck ALM Alarm System ALM404 Fault in the CAN Communication Solution

Recommend OBD2 Scanner

ME9.7 ECU Engine Computer ME9.7 ECU Engine Computer TabScan T6PT3G Diagnosis VCI for Porsche Diagnostic Tool Porsche Diagnostic Tool

Recent Comments

  • amr on MAN EOL Flash File Editor + MAN Immo Calculator Free Download
  • Pasquale Greenwald on Jungheinrich ETM/V 10-12 Tightening Torque for Screwed Connection on Brake Systems
  • VCDS on Scania SDP3 2.53.1 Diagnosis & Programming Free Download
  • Crossley on What are the functions of Iprog+ Programmer?
  • Lukas on VAG EDC15 EDC16 IMMO OFF Software Free Download

Archives

Categories

  • BMW Diagnostic Tool
  • Car Diagnostic Tool
  • Key Cutting Machine
  • Key Programming Tool
  • MB Star Diagnosis
  • OBD2 Code Scanner
  • Tech Support
  • VXDIAG

Tags

adapter Auto Pick and Decoder Car Key Copy Car Key Programmer cat Code Reader diagnostic software ECU Chip Tunning ecu programmer Ford gm handy baby Handy Baby 2 Key Programmer Handy Baby II Key Programmer HEX V2 immo iprog key Key Pro key programmer laptop Launch lish LISHI new arrivals nexiq nexiq link diesel truck interface nexiq truck diagnostic NEXIQ USB Link OBD2 obdii original program Scania VCI smart VAG COM Cable VCDS VCDS Cable VCDS VAG COM Cable vci VW wholesale X-PROG Box X-PROG Box ECU Programmer XPROG-M

Hot Selling

  • ME 9.7 ECU Engine Computer
  • MINI VCI J2534
  • NCF29XX Programmer
  • ThinkTool Pros+

Links

  • China OBD2
  • EPS Foam Machine
  • Foxdiag
  • Сканер OBD2
©2025 OBD2 Scanner Blog | Powered by chinaobd2