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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
OPERATION UNDER USUAL CONDITIONS
HYDRAULIC SYSTEM
INITIAL SETUP:
Personnel Required:
One Watercraft Engineer, 88L
CENTRAL HYDRAULIC SYSTEM HYDRAULIC POWER UNIT (HPU) STARTUP
1.
CLOSE the following valves, located in AMS 1:
a.
TH-3, RETURN CRSVR. TO CENT. HYD (figure 1, item 1)
b.
TH-2, PRESS CRSVR CTL HYDR TOW WN HYDR (figure 1, item 2)
c.
TH-4, DRAIN CRSVR. TO CENT. HYD. (figure 1, item 3)
2.
In the engine room, on the port side, at the central hydraulic system reservoir (figure 2, item 1), verify that the hydraulic
fluid level is at full in the hydraulic reservoir sight glass (figure 2, item 2). If the hydraulic fluid level is low, add
hydraulic fluid at the breather (figure 2, item 3) until the fluid level on the sight glass is full.
3.
Set to ON the CENT HYD SYS POWER UNIT NO. 1 & 2 circuit breaker (figure 3, item 1) on the main switchboard.
4.
Set to ON the MAIN switch (figure 2, item 4) on the central HPU motor controller (figure 2, item 5).
5.
To enable local operation of the central hydraulic system, set to ON the REMOTE/OFF/ON switch (figure 2, item 6) at
the central HPU motor controller (figure 2, item 5). To enable remote operation from the EOS, set to REMOTE the
REMOTE/OFF/ON switch.
! CAUTION
Only one pump is required to operate the power pack. Both pumps may be used, but the reser-
voir temperature must be checked frequently. If oil temperature exceeds 180 F (82 C), or a low
oil level is indicated, shut down the system immediately. Operating the pumps with hot and/or
low oil could damage the equipment.
6.
Set the P1/P2/P1 & 2 switch (figure 2, item 7) to the P1, P2, or P1 & P2 position. In the P1 position, pump 1 is enabled;
in the P2 position, pump 2 is enabled; and in the P1 & P2 position, both pumps are enabled.
7.
Verify that the READY light (figure 2, item 8 and/or 9) is illuminated for the selected pump(s).
8.
If local operation was selected in step 5, press the START pushbutton (figure 2, item 10) to start the selected pump(s).
If remote operation was selected, press the NO.1 & 2 HYD PMP pushbutton (figure 4, item 1) to start the selected
pump(s).
9.
Verify that the RUNNING indicator(s) (figure 2, items 11 and/or 12) are illuminated for the selected pump(s).
0076 00-1
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