Section E - Hydraulics
Valves
Typical Spool
E-137 E-137
9803-9340-8
Typical Spool
Dismantling and Assembly
CAUTION: Absolute cleanliness is essential when
stripping and assembling hydraulic components.
The numerical sequence shown on the illustration is
intended as a guide to dismantling.
For assembly the sequence should be reversed.
Spools
Spools 14 must not be interchanged as they are matched
to their bores.
Lubricate new seals with Hydraulic Fluid and take care to
prevent them from being damaged by the sharp edges of
the spool.
Apply JCB Threadlocker & Sealer to threads of screw 10
K Sealing and Retaining Compounds ( T 1-29).
Check Valves
Each spool has an identical load hold check valve, items
19 to 22.
Ensure good condition of seating face on poppet 20 and on
the mating face in the valve block.
Auxiliary Relief Valves
Ensure that A.R.V's 1 are correctly adjusted and fitted in
their specified positions. Where relief valves are not
required a blanking plug 1a is used.
The manufacturer does not recommend renewing
individual components of the A.R.V.'s. Each valve should
be renewed as a unit if a component is defective.
Renew all 'O' rings. Lubricate parts with Hydraulic Fluid
before assembly.
The A.R.V's are tested on a bench
K Auxiliary Relief
Valve (ARV) - Using Hand Pump ( T E-141).
708170-1
Fig 5.
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