Komatsu 830E-AC, Shop Manual

Page: 695 / 1085

L05035 Steering Component Repair L5-11
14. After charging to the correct pressure, close
valve (2). Let the pre-charge set for 15 minutes.
This will allow the gas temperature and pres-
sure to stabilize. If the desired precharge is low,
adjust regulator, open valve (2) and add more
nitrogen to obtain correct pressure on gauge
(9). If precharge has exceeded the recom-
mended pressure, then slowly bleed-off nitro-
gen pressure to obtain correct pressure.
Nitrogen precharge is 9653 kPa (1400 psi) at
21°C (70°F) for all accumulators.
Do not reduce precharge by depressing valve
core with a foreign object. High pressure may
rupture rubber valve seat.
15. With a wrench, tighten swivel nut (4, Figure 5-6)
to 7-11 N·m (5-8 ft lbs) of torque to close inter-
nal poppet.
16. Turn "T" handle counterclockwise as far as it will
go. Hold gas valve body (6) with a wrench to
keep it from turning and loosen swivel connec-
tor to remove charging hose assembly. Check
for nitrogen leaks using a common leak reac-
tant.
NOTE: If a new charging valve was installed, the
valve stem must be seated as follows:
a. Tighten small hex swivel nut (4, Figure 5-6)
to 14.2 N·m (10.5 ft lbs) torque.
b. Loosen small hex swivel nut.
c. Retighten small hex swivel nut to 14.2 N·m
(10.5 ft lbs) torque.
d. Again, loosen small hex swivel nut.
e. Finally, tighten small hex swivel nut to 5.4
N·m (4 ft lbs) torque.
17. Install and tighten cap (6, Figure 5-3) to 11.5-17
cm-kg (10-15 in. lbs) of torque and install valve
guard (5). (Gas valve cap serves as a second-
ary seal.) Close valve on nitrogen supply tank.
18. Install bleed plug(s) (12, Figure 5-5). If opened,
close brake accumulator bleed down valves.
19. Operate truck and check steering for normal
operation.
20. Check hydraulic oil level.
TABLE 1. Fill Rates and Lubrication Quantities
Capacity
(Gallons)
Fill time (Minutes) to obtain
Low Pressure of 172 kPa (25 psi)
Oil Lubrication
Quantity (5%)
5 (and below) 2 0.94 l (32 oz)
7.5 3 1.4 l (48 oz)
10 3 1.9 l (64 oz)
12.5 4 2.3 l (80 oz)
16.5 4 3.1 l (106 oz)