Page 25
65-J Desel - Servce & Parts Manual
February 2021
Secton 10 - Hydraulc System
Hydraulic Manifolds
Note:
Refer to Parts Section 25 - Hydraulics.
This machine has three hydraulic valve manifolds: the Main Functions Manifold, the Brake/Axle/2-
Speed Manifold and the Boom Functions Manifold.
Additional hydraulic manifolds include the Brake and Steering junction blocks at the steering end of
the chassis and the Rotary Manifold provides hydraulic connection between the turntable and chassis
and allows continuous rotation of the turntable.
Clean all fittings before disconnecting hoses������
Tag all hoses and wiring for proper reassembly������
Plug all openings immediately to prevent contamination������
Replace any O-rings and inspect all hoses for crack and damage before
reassembly������
REMOVAL
Disconnect the negative battery terminal.
Close the ball valves on the Hydraulic Tank to prevent fluid loss when the hoses are removed.
Tag and disconnect the solenoid valve electrical leads.
Tag and disconnect hydraulic hoses. Immediately cap the openings to prevent contamination.
Remove the bolts that hold the manifold to the mounting bracket.
Remove the manifold block.
Disassembly
Remove coils from solenoid valves.
Mark and remove valves.
Mark and remove fittings, plugs, springs, balls, and orifices.
Cleaning And Inspection
Wash the manifold in cleaning solvent to remove built-up contaminants, then blow out all
passages with clean compressed air.
Inspect the manifold for cracks, thread damage and scoring where O-rings seal against internal
and external surfaces.
Wash and dry each component and check for thread damage, torn or cracked Orings, and
proper operation.
Replace defective parts and O-rings.
Assembly
Note:
Lubricate all O-rings before installation to prevent damage to the O-ring. Seat balls in manifold
block by lightly tapping on the ball with a brass drift punch.
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