Lull 6K Service Manual - Manual (Page 601)

Brakes
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 9-27
18. Use a hammer and wood block to tap piston into the bore until it is
about two inches below start of honed bore surface. To prevent piston
from bouncing back and damaging the V-ring, keep force against
piston while tapping piston through bore chamfer. Cover gas end
opening of accumulator body to keep dirt out.
19. Install new O-rings (Items 7 and 13) on end caps (Items 6 and 14).
Note: Care should be taken not to drag end cap O-rings over threads in body.
Each end cap should be flush with or above the end of the accumulator
body within 1/32” to 3/32”. The end cap will stop against chamfer leading
into honed bore. Since O-ring sealing is not dependent upon cap tightness,
extreme tightness is not required.
20. Install hydraulic end cap (Item 14) on hydraulic end of accumulator
body.
21. Push piston fully down until it contacts hydraulic end cap.
Important: If piston is not in contact with hydraulic end cap, it will slam into end
cap when accumulator is pre-charged.
22. Install gas end cap (Item 6) on gas end of accumulator body.
23. Install new O-ring (Item 5) on gas valve (Item 4) and install valve in end
cap. Pre-charge the accumulator with nitrogen. See “Pre-Charging
Accumulator” on page 9-19 for procedures.
Installation
Accumulator
Models with Control Manifold Hydraulics
6K-37 (S/N 101–317)
6K-42 (S/N 101–119)
8K-42 (S/N 101–220)
10K-42 (S/N 101–106)
10K-54 (S/N 101–103)
644B-37 (S/N 101–590, 592–666)
644B-42 (S/N 101–207)
844C42 (S/N 101–521)
1044C-42 (S/N 101–116)
1044C-54 (S/N 101–154) The following installation procedure refers to Fig. 9-14 on page 9-23.
1. It is usually easier to pre-charge the accumulator before installation on
the machine. See “Pre-Charging Accumulator” on page 9-19 for
procedures.
2. Install elbow (Item 11) in accumulator bottom (Item 5). Torque to
40–44 ft-lbs and cap elbow.
3. Install accumulator into mounting bracket (Item 6). Position
accumulator so that bottom holes line up with holes in valve plate.
4. Secure accumulator to valve plate with three (3) lockwashers (Item 12)
and capscrews (Item 13). Torque capscrews to 65 ft-lbs.
5. Tighten hex nut (Item 7), lockwasher (Item 8), and capscrew (Item 9) to
secure the accumulator to the mounting bracket. Torque hex nut to
50 in-lbs.
6. Connect hydraulic hose (Item 10) to elbow. Torque swivel nut to
44–48 ft-lbs.