TM 5-3810-306-10
c.
Connect 38-foot long hose (with couplings on
both ends) to quick coupler on hand pump. This
is the hand pump pressure hose.
2.
Lower load.
a.
Check to make sure that load can be lowered
without contacting extended outrigger or crane
carrier. If necessary, retract boom, (step 3) or
rotate boom (step 5) enough to assure safe load
lowering.
b.
Loop hand pump pressure hose out from under
hydraulic tank cover and carry loose end up onto
superstructure to hoist (main or auxiliary as
applicable).
c.
Uncouple hoist brake release quick coupler of
hoist supporting load.
d.
Install loose end of hand pump pressure hose to
half of quick coupler leading to hoist brake.
e.
Pump hand pump lever. By pumping the handle,
hydraulic pressure is applied to the hoist brake,
releasing the brake and slowly lowering the load.
f.
Disconnect hand pump pressure line and
reconnect hoist brake release quick coupler after
load has been lowered to ground.
3.
Retract boom.
NOTE
Retracting the boom is a two person
operation.
a.
Carry loose end of hand pump pressure line onto
superstructure.
b.
Open cover on control valve compartment
(behind cab).
c.
Locate tele-rear steer-lift valve bank (center of
control valve compartment).
d.
Remove dust cover on male coupler installed on
inlet section of valve bank. Connect hand pump
pressure hose at coupler.
e.
Instruct operator in cab to pull back on TELE
control lever. Hold lever in this position.
f.
Pump hand pump lever. By pumping the handle,
hydraulic pressure is applied to the telescope
cylinder
control
valve
causing
the
boom
telescope section to slowly retract.
g.
Return TELE control lever to neutral position
after boom has been retracted.
h.
Disconnect hand pump pressure hose at control
valve bank and install dust cap on male
coupling.
4.
Lower boom.
NOTE
If transporting crane, do not lower boom
beyond horizontal.
a.
Carry bleed-down hose (12-foot long hose with
only one coupling) onto superstructure.
b.
Ensure that lift bleed-down valve is in OFF
position.
c.
Remove dust cover on male coupler on bleed-
down valve.
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