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 TM 55-1925-273-10-2
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
OPERATION UNDER UNUSUAL CONDITIONS
TOWING MACHINE OPERATION POWERED BY CENTRAL HYDRAULICS
INITIAL SETUP:
Personnel Required:
References:
One Watercraft Engineer, 88L
WP 0089 00 (volume 1)
WP 0102 00 (volume 1)
TOWING MACHINE POWERED BY CENTRAL HYDRAULIC SYSTEM
1.
Check the towing machine to ensure that all controls are disengaged.
2.
OPEN the following valves in AMS 1:
a.
TH-2, PRESS CRSVR. CTL HYDRTOW WN HYDR (figure 1, item 1)
b.
TH-1, C.O.V.-PMP DISCH. TO TOW WN. HYD (figure 1, item 2)
c.
TH-4, DRAIN CRSVR. TO CENT. HYD. (figure 1, item 3)
d.
TH-3, RETURN CRSVR. TO CENT. HYD (figure 1, item 4)
3.
CLOSE the following valves in AMS 1:
a.
TH-14, FLOW CONTROL (figure 1, item 5)
b.
CH-26, DRN CUT-OUT TOW WN HYDR (figure 1, item 6)
c.
CH-27, RTN CUT-OUT TOW WN HYDR (figure 1, item 7)
4.
Set to ON the CENT HYD SYS PWR UNIT NO. 1 & 2 circuit breaker (figure 2, item 1) on the main switchboard.
5.
At the central hydraulic system control panel, set the MAIN switch (figure 3, item 1) to ON.
6.
To enable local operation of the central hydraulic system Hydraulic Power Unit (HPU) from the local control panel
(figure 3, item 2), set to ON the REMOTE/OFF/ON switch (figure 6, item 3). To enable remote operation from the
EOS, set the REMOTE/OFF/ON switch to REMOTE.
! CAUTION
The reservoir 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.
7.
Set the P1/P2/P1 & 2 switch (figure 3, item 4) to the P1 & P2 position. Operation of both pumps is required to properly
support towing machine operations.
8.
At the central hydraulic control panel, verify that the READY lights (figure 3, items 5 and 6) are illuminated for both
pumps.
9.
If local operation was selected in step 6, press the START pushbutton (figure 3, item 7) on the central hydraulic
control panel to start the pumps. If remote operation was selected, press the NO. 1 & 2 HYD PMP pushbutton
(figure 4, item 1) to start the selected pump(s).
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