9-37
PTT unit
14. Repeat steps 2–4 to check the fluid level.
15. Connect the battery jumper leads to the
PTT motor lead “1” to fully retract the
PTT rams, and then measure the hydrau-
lic pressure when the reading on the
pressure gauge stabilizes.
16. Reverse the connection between battery
jumper leads and the PTT motor lead “1”
to fully extend the PTT rams.
17. Remove the special service tools.
Be careful when removing the special ser-
vice tool. Fluid could be expelled force-
fully from the PTT unit due to internal
pressure.
18. Install the main valve “1”, and then
tighten it to the specified torque.
TIP:
Install the main valve “1” quickly before any
fluid flows out of the hole.
19. Repeat steps 2–4 to check the fluid level.
Bleeding the PTT unit
1. Place the PTT unit in an upright position.
2. Turn the manual valve “1” clockwise to
close it.
PTT hydraulic gauge adapter “1”:
90890-06863
Hydraulic pressure gauge “2”:
90890-06776/06800
Hydraulic pressure (down):
5.85–8.85 MPa
(58.5–88.5 kgf/cm
2
,
848.3–1283.3 psi)
Ram PTT motor lead Battery
Retract
Green (G) (+)
Blue (L) (–)
1
2
L
G
1
Ram PTT motor lead Battery
Extend
Blue (L) (+)
Green (G) (–)
Main valve “1”:
11 N·m (1.1 kgf·m, 8.1 ft·lb)
L
G
1
1
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