Dawson HPH 1200, User Manual

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c. Change hydraulic return filter element.
(i) Replacement element
(ii) Remove filter bowl
(iii) Remove and discard filter element (do not clean)
(iv) Wash bowl thoroughly
(v) Fit replacement element onto spigot
(vi) Fill filter bowl with clean hydraulic oil
(vii) Replace bowl O' ring if necessary
(viii) Re-assemble filter
d. Pump removal/re-fitting.
(i) IMPORTANT NOTE - the hydraulic pump should be returned to the
manufacturer for repair/overhaul. This item
must not be stripped or tampered with.
(ii) Isolate pump from hydraulic oil reservoir using pump isolator valve
(iii) Remove hoses (3 off) from pump body
(iv) Remove 2 off mounting screws from front flange of pump
(v) Withdraw pump from coupling towards oil reservoir
(vi) Remove bellhousing from engine mounting flange
(vii) Reverse procedure for re-assembly
(viii) Fill case drain of pump with clean hydraulic oil prior to start up following removal
from the system (port located on the top of the pump with adaptor fitted)
e. Cooler removal/re-fitting.
(i) Close pump isolator valve to prevent system syphoning
(ii) Remove 2 off flexible hoses from cooler
(iii) Remove mounting bolts from cooler
(iv) To remove matrix, remove top and bottom retaining strips from front of
cooler and withdraw matrix from front of cooler assembly
(v) To remove fan remove matrix and withdraw fan from motor shaft
(vi) To remove motor remove matrix and fan, unbolt motor from back of cooler
f. Control valve assembly.
(i) Close pump isolator valve to prevent system syphoning
(ii) To replace solenoid coils remove plastic retainer from end of coil and
withdraw coil from retaining tube
(iii) To replace valve assemblies remove 4 off retaining screws from top of valve and
replace component as necessary