Lull 944E-42 Service Manual - Manual (Page 137)

8-21 944E-42
Hydraulic System
2. Install the relief valve (15) preset to 2400 psi
(165 bar) into the “B” side of the transfer carriage
section. Torque the relief valve to 33 ± 3.5 lb-ft
(45 ± 4,8 Nm).
3. Install the spring and plunger into the spool end
housing (17). Place the spool end housing on the
end of the spool. Secure the spool end housing to
the transfer carriage section and install two
capscrews.
4. Place the lower compensator plunger followed by the
spring and the upper compensator plunger (18) into
the cavity on top of the transfer carriage section.
Secure in place with the hex plug and new oiled
o-ring. Torque the plug to 48 ± 5 lb-ft (65 ± 7 Nm).
5. Place the four new oiled o-rings in place on the
transfer carriage section (13). Carefully slide the
transfer carriage section onto the four hex head
socket capscrews and set tightly against the inlet
section (12).
Auxiliary Hydraulic Section Assembly
1. Install the relief valve (15) preset to 2900 psi
(200 bar) into the “A” and “B” sides of the aux
hydraulic section. Torque the relief valve to 33 ± 3.5
lb-ft (45 ± 4,8 Nm).
2. Install the spring and plunger into the spool end
housing (17). Place the spool end housing on the
end of the spool. Secure the spool end housing to
the aux hydraulic section and install two capscrews.
3. Place the lower compensator plunger followed by the
spring and the upper compensator plunger (18) into
the cavity on top of the aux hydraulic section. Secure
in place with the hex plug and new oiled o-ring.
Torque the plug to 48 ± 5 lb-ft (65 ± 7 Nm).
4. Place the four new oiled o-rings in place on the aux
hydraulic section (14). Carefully slide the aux
hydraulic section onto the four hex head socket
capscrews and set tightly against the transfer
carriage section (13).
5. Place the four new oiled o-rings in place on the
mono block section. Carefully place the aux
hydraulic section (14), transfer carriage section (13)
and inlet section (12) against the mono block (11).
Tighten the four hex socket head capscrews to hold
all the sections together. Torque the four capscrews
to 25 ± 2.5 lb-ft (34 ± 3,4 Nm).
f. Main Control Valve Installation
1. Place the assembled main control valve into position
on the valve plate assembly and align the bolt holes.
2. Insert the two long capscrews (1) and the short
capscrew (2) through the valve and tighten into the
valve plate assembly.
3. Use new oiled o-rings as required. Uncap and
connect all previously labeled hoses, clamps, etc. to
the main control valve.
4. Using the floor jack, raise the sub plate, with the
valve plate assembly, up into position.
5. Line up the mounting holes in the cab support (3)
and the holes in the sub plate (4). Secure in place
with the capscrews and flat washers (5).
6. Reassemble the step. Refer to Section 4.6, “Cab
Installation,” for step assembly procedures.
7. Check the routing of all hoses, wiring and tubing for
sharp bends or interference with any rotating
members, and install tie wraps and/or protective
conduit as required. Tighten all tube and hose
clamps.
8. Fill the hydraulic fluid reservoir. Refer to Section
8.5.2, “Hydraulic Oil Reservoir Filling.”
MU3871
2
1
MU3822
3
4
5