JLG 4017RS Service Manual - Manual (Page 147)

8-17 3614RS, 4017RS
Hydraulic System
Use the following steps to properly pre-charge each damper:
1. Thoroughly clean the top of each damper (8).
2. Make sure the nitrogen supply is shut off.
3. Attach the damper fill kit (9) to the nitrogen bottle.
4. Remove the protective cap from the gas valve on the
damper.
5. Back the “T” handle (10) on the damper fill kit all the
way out (counter-clockwise). Attach the schrader
adaptor (11) to the gas valve on the damper. Tighten
securely.
6. Turn the gas valve/bleed valve (12) on the damper fill kit
all the way in.
7. Turn the “T” handle (10) all the way in to open the valve
core on the damper.
8. Open the valve (13) on the nitrogen bottle.
9. Slowly adjust the regulator (14) on the nitrogen bottle
to read 35 bar (507 psi).
10. Close the main valve (13) on the nitrogen bottle.
11. Back the “T” handle (10) on the damper fill kit all the
way out (counter-clockwise).
12. Let the pre-charge on the damper set for 10-15 minutes.
This will allow the gas temperature to stabilize. If the
desired pre-charged range is exceeded, turn the “T”
handle (10) all the way in. With the main valve (13)
closed on the nitrogen bottle, turn the gas valve/
bleeder valve (12) out to bleed pressure off the damper.
Turn the valve all the way in and check the pressure
reading on the regulator gauge.
13. When the correct pressure is reached, back the “T”
handle (10) on the damper fill kit all the way out
(counter-clockwise). Bleed the pressure from the hose
by turning the gas valve/bleed valve out to relieve the
pressure.
14. Turn the gas valve/bleed valve (12) all the way in and
remove the schrader adapter (11) from the valve on the
damper.
15. Reassemble the protective cap onto the gas valve on
the damper.
8.9.10 Checking Pre-Charge
a. Gas Leaks
1. If an external leak is suspected, apply soapy water to the
gas valve (1) and the fitting of the gas bottle (2). If
bubbles form, the damper has to be replaced.
2. If an internal leak is suspected, check for foaming oil in
the hydraulic reservoir and/or no damper action. If any
of these signs are evident, the damper has to be
replaced.
MZ8110
10
11
14
12
9
8
13
MZ8100
1
2