Lull 944E-42 Service Manual User Manual download pdf (Page 435)

100

101

8.183

Model 644E-42/944E-42 Rev. 6/04

Hydraulic System

Inlet Section Assembly

1. Install the main relief valve (1) with new seals into

the side of the inlet section (2). Torque the main

relief valve to 33 ±3.5 lb-ft (45 ± 4,8 Nm). Refer to

the Parts Manual for seal kits.

2. Install the unloader valve (3) with new seals into the

side of the inlet section (2). Torque the unloader

valve to 48 ±5 lb-ft (65 ±7 Nm). Refer to the Parts

Manual for seal kits.

3. Insert the four hex socket head capscrews (4)

through the inlet section.

Transfer Carriage Section Assembly

1. Install the relief valve (5) preset at 3700 psi (255 bar)

with new seals into the “A” side of the transfer

carriage section (7). Torque the relief valve to

33 ±3.5 lb-ft (45 ± 4,8 Nm). Refer to the Parts

Manual for seal kits.

2. Install the relief valve (6) preset at 2400 psi (165 bar)

with new seals into the “B” side of the transfer

carriage section (7). Torque the relief valve to

33 ±3.5 lb-ft (45 ± 4,8 Nm). Refer to the Parts

Manual for seal kits.

3. Install the spring (8) and plunger (9) into the spool

end housing (10). Place the spool end housing with

a new oiled o-ring (11) into position on the end of the

spool. Be sure the spool end housing rests square

on the side of the transfer carriage section (7).

Secure the spool end housing in place with the two

hex socket head capscrews (12). Torque the

capscrews to 7 ±1 lb-ft (9,5 ±1,4 Nm). Repeat for the

other side of the section.

4. Place the lower compensator plunger (13) followed

by the spring (14) and the upper compensator

plunger (15) into the cavity on the top of the transfer

carriage section (7). Secure in place with the hex

plug (16) and new oiled o-ring (17). Torque the plug

to 48 ±5 lb-ft (65 ±7 Nm).

5. Place the three new oiled o-rings (18) in place on the

transfer carriage section (7). Place the new oiled o-

ring (19) in place on the transfer carriage section.

Carefully slide the transfer carriage section onto the

capscrews (4). Slide the section tight against the

inlet section.

Auxiliary Hydraulic Section Assembly

1. Install the relief valves (20) preset at 2900 psi

(200 bar) with new seals into the “A” side and the “B”

side of the auxiliary hydraulic section (21). Torque

the relief valves to 33 ±3.5 lb-ft (45 ± 4,8 Nm). Refer

to the Parts Manual for seal kits.

2. Install the spring (22) and plunger (23) into the spool

end housing (24). Place the spool end housing with

a new oiled o-ring (25) into position on the end of the

spool. Be sure the spool end housing rests square

on the side of the auxiliary hydraulic section (21).

Secure the spool end housing in place with the two

hex socket head capscrews (26). Torque the

capscrews to 7 ±1 lb-ft (9,5 ±1,4 Nm). Repeat for the

other side of the section.

3. Place the lower compensator plunger (27) followed

by the spring (28) and the upper compensator

plunger (29) into the cavity on the top of the auxiliary

hydraulic section (21). Secure in place with the hex

plug (30) and new oiled o-ring (31).Torque the plug

to 48 ±5 lb-ft (65 ±7 Nm).

4. Place the three new oiled o-rings (32) in place on the

auxiliary hydraulic section (21). Place the new oiled

o-ring (33) in place on the auxiliary hydraulic section.

Carefully slide the auxiliary hydraulic section onto

the capscrews (4). Slide the section tight against the

transfer carriage section.

5. Place the three new oiled o-rings (34) in place on the

mono block section (35). Place the new oiled o-ring

(36) in place on the mono block section.

6. Carefully place the auxiliary hydraulic section (21),

transfer carriage section (7) and inlet sections (2)

against the mono block (35). 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).

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Lull 944E-42 Service Manual User Manual Page 435

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