Lull 6K Service Manual - Manual (Page 185)

Supply, Pressure, and Return Hydraulics
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 5-41
4. Remove caps and clean hydraulic hose ends (Items 5, 6, 12, and 13)
with appropriate solvent. Dry with compressed air.
5. Reconnect hydraulic hoses to fittings as instructed in Chapter 3 of this
manual. Refer to the sketches and notes made earlier and adjust
fittings as necessary so that they are in the same position as prior to
being disconnected. For final tightening, torque the hose ends (Items 5
and 6) connected to the two (2) O-ring connectors (Item 9) to
130–150 in-lbs. For final tightening, torque the hose ends (Items 12
and 13) connected to the two (2) 45° O-ring elbows (Item 14) to 79-88
ft-lbs.
6. Start the engine and check for hydraulic leaks. Correct as necessary.
7. For models 644B, 844C, and 1044C, refer to roll-back hose tray
installation procedures on page 5-96.
Models with Mid-inlet Hydraulics
6K-37 (S/N 318–)
6K-42 (S/N 120–)
8K-42 (S/N 221–)
10K-42 (S/N 107–)
10K-54 (S/N 104–)
644B-37 (S/N 591, 667–)
644B-42 (S/N 208–)
844C-42 (S/N 622–)
1044C-42 (S/N 117–)
1044C-54 (S/N 155–) (Ref. Fig. 5-25 and Fig. 5-26) The following procedure is for the installation
of the hydraulic pump for models with a mid-inlet hydraulic system.
Step 1 thru Step 5 refer to Fig. 5-26.
1. If the pump support brackets were removed,
a. Install lower pump support bracket on park brake cylinder mount
with two (2) capscrews (Item 26), flatwashers (Item 15),
lockwashers (Item 14), and nuts (Item 13). Torque nuts to 180 in-
lbs.
b. Install upper pump support bracket on lower pump support bracket
with three (3) capscrews (Item 24), flatwashers (Item 23),
lockwashers (Item 17), and nuts (Item 16). Torque nuts to 180
in-lbs.
2. Insert assembled hydraulic pump straight into the transmission making
sure the pump is supported so it cannot twist and cause damage.
Install the pump on the transmission with the two (2) capscrews
(Item 3) and lockwashers (Item 4). For final tightening, torque
capscrews to 55 ft-lbs.
3. Secure upper pump support bracket to pump with two (2) each
flatwashers (Item 21), lockwashers (Item 20), and capscrews
(Item 19). Torque capscrews to 276 in-lbs.
4. Connect hydraulic suction hose (Item 12) to pump by installing two (2)
flange halves (Item 9) and four (4) lockwashers (Item 10) and
capscrews (Item 11). Torque capscrews to 55 ft-lbs.
5. Connect two (2) hydraulic hoses (Item 1) on elbows (Item 2) on side of
pump. For final tightening, torque swivel nuts on hoses to 79–88 ft-lbs.
Step 6 thru Step 16 refer to Fig. 5-26.
6. install hydraulic hose (Item 7) from Pump 1 test port to reducer adapter
(Item 6). For final tightening, torque swivel nut on hose to 130–150 in-
lbs.