Lull 6K Service Manual - Manual (Page 223)

Supply, Pressure, and Return Hydraulics
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 5-79
6. Tag and slowly loosen six (6) hydraulic hoses (Items 3, 5, 7, 10, 14,
and 17) and bleed any remaining oil into appropriate container.
Disconnect hoses. Cap fittings and hoses.
7. Loosen and remove the two (2) each nuts (Item 11) and lockwashers
(Item 12) that secure the pump unloader valve (Item 13) to the
mounting bracket (Item 2).
8. Remove the two (2) capscrews (Item 1) and the pump unloader valve
assembly. Take nuts, lockwashers, capscrew, and pump unloader
assembly to an appropriate area for further cleaning and disassembly.
9. Tag and remove all six (6) elbows (Items 4, 6, 8, 9, 15, and 16). Clean
elbows, capscrew, nut, and lockwasher with an appropriate solvent and
dry with compressed air. Replace any damaged elbows.
Overhaul
Pump Unloader Valve
Fig. 5-48: Pump Unloader Valve
06
-9
0
1
3
1
# Description
1 Shuttle Valve Cartridge
2 Backup Rings
3 O-Ring
4 Body
5 Backup Rings
6 O-Ring
7 O-Ring
8 Check Valve Cartridge
9 Hollow Hex O-Ring Plug
# Description
10 Piloted Valve Cartridge
11 O-Ring
12 Backup Rings
13 O-Ring
14 Backup Rings
15 O-Ring
16 Backup Rings
17 O-Ring
2
4
3
5
6
7
8
9
10
11
13
15
17 16
14
12