BOOM RT9130E-2 SERVICE MANUAL
4-28 Published 11-22-2016, Control # 345-12
HOSE REEL
Description
The hydraulic hose reel (Figure 4-6) supplies the boom
manifold for the upper telescope cylinder. The hose reel is
mounted in the turntable center section, under the boom.
The hose reel is spring return. The spring return provides
drag on the hoses so that no slack develops when the
telescope cylinders are being extended or the boom is being
lowered, and retrieves the hoses as the telescope cylinders
are being retracted or when the boom is raised.
Maintenance
Service
Lubricate the hose reel spring with engine oil through the
drain access holes located around the circumference of the
spring cover. Lubricate every 50 operating hours.
With the boom fully retracted, spray motor oil, under
pressure, into the hose reel spring housing. The spring
should be saturated with oil. If air pressure lubricating
equipment is not available, use a pump oil can, but ensure
the spring is completely saturated with oil.
Removal
1. Secure the rotation of the hose reel by using the
retaining bolt and drum locking bracket.
2. Tag and disconnect the hydraulic supply hoses for the
hose reel assembly; cap hoses and openings.
3. Tag and disconnect the hose reel hydraulic hoses from
the manifold block assembly; cap hoses and openings.
4. Remove the capscrews and washers securing the hose
reel to the turntable, remove the hose reel.
Installation
1. Position the hose reel assembly on the turntable and
secure with the washer and capscrews.
2. Pre-tension twin-line hose by rotating the twin line
section of hose reel only two complete revolutions
counterclockwise (as seen from left side of crane looking
in). There must be two complete revolutions of the reel
spring maintained when the boom is level and fully
retracted.
3. Assemble brake (Figure 4-7) onto brake disc and adjust
as follows:
a. Ensure the brake pads and disc are free of grease
and oil.
b. Loosen setscrew and unscrew spring brake housing
enough to slide brake over brake disc.
c. Pressurize brake housing to 1200 psi (8274 kPa).
d. Screw in spring brake housing until a total gap of
0.012 in (.304 mm) exists between disc and pads.
e. Retighten spring brake housing setscrew using
access hole provided in brake mount.
f. Secure brake mount to hose reel housing using the
capscrew. Make sure to maintain the 0.012 in (.304
mm) gap as noted in step d.
g. Release the 1200 psi (8274 kPa) hydraulic
pressure.
4. Install sprocket (Figure 4-7) as follows:
a. Do not use lubricants during installation. Remove all
oil and grease from tapered surface of bushing and
sprocket.
b. Slide the loosely assembled unit on shaft.
c. Carefully tighten capscrews alternately and
progressively until the tapers are seated
(approximately half of recommended torque).
d. Continue careful alternate and progressive
tightening of the capscrews. Do not over-torque.
e. When properly mounted, there will be a gap
between the bushing flange and the sprocket.
5. Install chain. Use the lockwasher, flatwasher and hex
nut to apply tension. Measure chain slack near the
center of chain span. Chain slack should be 0.25 in ±
0.12 (0.6 cm ± 0.3)(Figure 4-7).
6. Connect the hydraulic supply hoses to the hose reel
assembly.
NOTE: Ensure there is enough hose unwound from the
hose reel to attach the hoses to the telescope
cylinders.
DANGER
Before disconnecting the hoses from the outer mid
telescoping cylinders, secure the hoses from rotating by
using the hose reel retaining bolt and drum locking
brackets.
DANGER
Ensure the retaining bolt remains installed until the hoses
are attached to the telescope cylinders.
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