Piston Motor And Control Valve; Description; Maintenance - Manitowoc Grove RT530E-2 Service And Maintenance Manual

RT530E-2 SERVICE MANUAL
4. Using a protractor, lay it on the vertical line on the hoist
drum so the string line is in the center of the protractor.
The string line will be at the 90 degree mark on the
protractor if the hoist is straight with the boom nose
sheave. If it is not at the 90 degree mark, the hoist
mounting bolts will have to be loosened and the hoist
moved so it is.
NOTE: This test is for cable leaving gaps while spooling.
CAUTION
Do not alter holes or stop blocks on the crane mounting
plate, as very small adjustments result in large angular
changes. Extreme care should be taken to avoid over-
correction.
5. Elevate the boom above 45 degrees boom angle to
check if the hoist is level. Reposition the hoist drum and
tighten the cord so you can have the cord in the center of
the protractor at the 90 degree mark. If the cord is not at
the 90 degree mark, the hoist will have to be shimmed
until the cord is at the 90 degree mark.
NOTE: This test is for cable piling up on one side of the
hoist drum.

PISTON MOTOR AND CONTROL VALVE

Description

The piston motor is a bent axis, bidirectional, variable
displacement heavy-duty motor. The motor is bolted to the
hoist and is geared directly to the hoist planetary.
The motor control valve is bolted to the motor.

Maintenance

Removal
1. Thoroughly clean the external surfaces of the drum and
motor with steam or clean solvent and blow dry.
2. Tag and disconnect the hydraulic lines connected to the
hoist motor and the motor control valve.
3. Remove the capscrews and lockwashers that secures
the motor and motor control valve to the hoist.
NOTE: The HP15C-17G hoist motor weighs approximately
28 kg (62 lb).
4. Place the motor and motor control valve in a clean, dry
suitable work area.
Installation
NOTE: Care must be taken to assure the primary thrust
plate remains properly located in its counterbore
when the motor is re-installed. If the winch is
GROVE
operated with the primary thrust plate wedged
between the primary gears and the planet carrier,
or with a thrust washer out of position severe
damage to internal winch components could result.
1. Install a new O-ring on the motor pilot then lubricate with
petroleum jelly or gear oil. Engage the motor shaft with
the brake clutch inner race and lower into place.
2. Apply Loctite No. 243 to the mounting bolts, and install
the bolts and lockwashers. Torque the bolts to 102 Nm
(75 lb-ft).
3. Connect the hydraulic lines as tagged during removal.
4. Fill the drum with oil. Refer to Section 9 - LUBRICATION
in this manual.
5. Idler Drum and Cable Follower

Description

The main and auxiliary hoists are equipped with an idler
drum on the forward side of the hoist. The main hoist idler
drum is used to keep the hoist cable from coming in contact
with the boom. When the crane is also equipped with an
auxiliary hoist, the idler drum on the auxiliary hoist is used to
keep the hoist cable from coming in contact with the main
hoist. The cable follower is mounted on the rear side of it's
respective hoist. The cable follower applies a downward
spring pressure against the cable onto the hoist drum, to
ensure that the cable will be uniformly wound onto the hoist
drum, and also prevent cable from jumping under abnormal
line conditions.

Maintenance

Idler Drum
Removal and Disassembly
1. Remove the bolt, washer, and lockwasher from the right
side of the idler roller (Figure 5-5).
2. Support the idler roller and withdraw the shaft from the
left side. Take care not to lose the dowel pin on the end.
3. Remove the roller from between the side plates.
Cleaning and Inspection
1. Clean all rust and dirt from the shaft.
2. Inspect the shaft and roller for cracks, scoring, or
grooving. Replace if necessary.
Assembly and Installation
1. Position the roller between the side plates
2. Install the shaft through the left side plate and the roller.
Ensure the flat on the shaft end aligns with the stop
welded on the side plate, align the dowel pin.
Published 4-22-15, Control # 556-00
HOIST AND COUNTERWEIGHT
5
5-9