312C Excavator Machine Systems Pilot Valve (Oil Manifold) - Remove Caterpillar


Pilot Valve (Oil Manifold) - Remove
`
1.1. Removal Procedure

Removal Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
FT-2674  Vacuum Cap 
ZZ  6V-9508  Face Seal Plug 
6V-9829 Cap As 

Start By:

  1. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release".

Note: SERVICE DATA: TOOLING (ZZ) WILL NOT BE IDENTIFIED IN PHOTOGRAPHS IN THE REMOVAL OR IN THE INSTALLATION. THIS TOOLING IS SHOWN IN ORDER TO ASSIST THE EXPERIENCED SERVICEMAN.

Note: A hydraulic Oil sample should be obtained before any maintenance is performed in order to establish the system contaminant level. Refer to Operation and Maintenance Manual, SEBU7424-01, "Sampling Interval and Location of Sampling Valve".

Note: Put identification marks on all hose assemblies and all wire assemblies for installation purposes. Plug all hose assemblies. This helps to prevent fluid loss, and this helps keep contaminants from entering the system.


NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.



NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.

Dispose of all fluids according to local regulations and mandates.


------ WARNING! ------

Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.




    Illustration 1g00797829

  1. Remove the cap from the hydraulic tanks. Attach Tooling (A) to the hydraulic tank. Connect a pressure air source to Tooling (A) in order to create a vacuum in the hydraulic system. The vacuum will help minimize leakage from the hose assemblies.


    Illustration 2g00846646

  2. Open the door on the right side of the machine. Pilot valve (1) is located below the main hydraulic pump and near the counterweight.

    Note: Limited access exists for the pilot valve. If you have a crane with sufficient lifting capacity, you can remove the counterweight for easier access to the pilot valve. The weight of the counterweight is approximately 2457 kg (5416 lb).



    Illustration 3g00846670

  3. Disconnect harness assembly (2) from each of the three solenoids. Cut the cable straps which fasten the wires to the solenoids.

  4. Disconnect 13 hose assemblies (3) from pilot valve (1).

  5. Remove the bolts which secure pilot valve (1) to the machine and remove the pilot valve (1).

Information System:

HDB Series and M1 Series Heavy Duty Brushless Alternators Rectifier - Test
H45/H45S, H50/H50S, 63/H63/H63S, 70/70S/H70/H70S, H90C/H90CS and 100/H100/H100S Hydraulic Hammers Tool Bushing (Upper) - Inspect/Replace - H90C/H90Cs and H100/H100s Only
305 CR Mini Hydraulic Excavator Hydraulic System Relief Valve (Line) - Test and Adjust
305.5 Mini Hydraulic Excavator Travel Control
5230B Excavator Machine Electronic Control System Electronic Control Module (ECM)
305.5 Mini Hydraulic Excavator Machine System Specifications Travel Motor
HDB Series and M1 Series Heavy Duty Brushless Alternators Stator - Test
3500B Engines for 5130B and 5230B Excavators Power Shift Solenoid - Calibrate
5230B Excavator Machine Electronic Control System Harness Code and Attachment Code
HDB Series and M1 Series Heavy Duty Brushless Alternators Capacitor - Test
325C Excavator Boom/Stick/Bucket Combinations
M316C, M318C and M322C Excavators and M318C and M322C Material Handlers Quick Coupler Operation
5230B Excavator Machine Electronic Control System Switches
305 CR Mini Hydraulic Excavator Hydraulic System Engine Performance - Test - Engine Speed
3500B Engines for 5130B and 5230B Excavators E021 High Exhaust Temperature Derate
W345B Series II Material Handler Hydraulic System Speed Reducer
312C Excavator Machine Systems Main Hydraulic Pump - Remove
305 CR Mini Hydraulic Excavator Hydraulic System Cylinder Drift - Check
325C and 325C L Excavator Leaving the Machine
M316C, M318C and M322C Excavators and M318C and M322C Material Handlers Lifting Capacities - M318C Excavator with a One-Piece Boom
5230B Excavator Hydraulic System Travel Parking Brake
H115/H115S, H120/H120CS, H130/H130S, H140/H140S, H160/H160S, H180/H180S, and H195 Hydraulic Hammers Approved Machines
305 CR Mini Hydraulic Excavator Hydraulic System Cylinder Speed - Check
3500B Engines for 5130B and 5230B Excavators E039 Low Engine Oil Pressure Derate