5.
manifold. Allow hoses to drain into a suitable container.
Remove and discard O--rings from fittings.
Disconnect hydraulic hoses from fittings in lift relief
6. Thread cartridge valves carefully into correct man-
ifoldport.Thevalves shouldgoineasily withoutbinding.
Using a deep socket, torque cartridge valves to values
identified in Figure 18.
6.
Putcaps or plugs on disconnected hoses andfittings
to prevent contamination.
Manifold Installation (Fig. 17)
7.
nuts that secure lift relief manifold to machine frame.
Remove two (2) cap screws, flat washers and lock
1. If fittings were removed from lift relief manifold, lubri-
cate and place new O--rings tofittings.Installfittingsinto
manifold and torque fittings from 60 to 74 ft--lb (82 to
8.
9.
Remove lift relief manifold from machine.
100
N--m) (see Hydraulic Fitting Installation in the Gen-
eral Information section of this chapter).
If necessary, remove hydraulic fittings from manifold
(Fig. 18). Discard any removed O--rings.
2.
Positionliftreliefmanifoldtoframe.Installtwo(2)cap
screws, flat washers and lock nuts but do not fully tight-
en.
Manifold Service (Fig. 18)
NOTE: Adjustment of lift relief valves is NOT recom-
mended.
3.
and fittings.
Remove caps and plugs from disconnected hoses
1.
removing any of the cartridge valves.
Make sure the manifold isthoroughly cleaned before
4.
Lubricate and install new O--rings on manifold fit-
tings. Connect hydraulic hoses to fittings on manifold.
Properly tighten all connections (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).
IMPORTANT: Use care when handling a cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
5.
two (2) lock nuts.
Secure lift relief manifold to frame by fully tightening
2.
Using a deep socket, remove cartridge valves from
manifold. Notecorrect location ofallsealing andbackup
rings. Remove and discard sealing and backup rings
from valves.
6.
is out of Core Processor hydraulic system.
Operate machine hydraulic functions slowly until air
3.
for damage to the sealing surfaces, damaged threads
and contamination.
Visuallyinspectthemanifoldportandcartridgevalve
7.
add correct oil if necessary.
Check oil level in tow vehicle hydraulic reservoir and
A. Contamination may cause valve to stick or hang
up.Contaminationcanbecomelodgedinsmallvalve
orifices or seal areas causing valve malfunction.
20 ft--lb
N--m)
(27.1
3
UP
1
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
7
35
(47
ft--lb
N--m)
6
CAUTION
5
4
Use eye protection such as goggles when using
compressed air for cartridge valve cleaning.
60
to 74 ft--lb
to 100 N--m)
(82
4.
Clean cartridge valves by submerging valve in clean
8
mineral spirits to flush out contamination. Particles as
fine as talcum powder can affect the operation of the
valve. Be extremely careful to not damage cartridge.
Use compressed air for cleaning.
2
20
ft--lb
25
ft--lb
N--m)
(27.1
N--m)
(33.9
Figure 18
5.
Lubricate new cartridge valve seal kit components
1.
2.
3.
4.
Lift relief manifold
Raise relief valve
Lower relief valve
O--ring
5.
6.
7.
8.
Fitting (4 used)
O--ring
Counterbalance valve
Plug with O--ring
withcleanhydraulicoilandinstallonvalves.Thesealing
and backup rings must be arranged properly on the car-
tridge valves for proper operation and sealing.
ProCore Processor
Page 4 -- 23
Hydraulic System
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