GROVE
Published 10-21-2011, Control # 055-03
6-27
5540F/YB5515 OPERATOR’S MANUAL
MAINTENANCE
6
Replace the Hoist Gearbox and Brake Lubricant
Hoist Gearbox
1.
Lower the boom to lowest position, engage the parking
brake. Leave the engine running.
2.
Rotate the drum until the drain plug is visible in the hole
in the side of the mounting bracket.
3.
Clean around the gearbox breather and the fill/check
plug hole. Remove the gearbox breather (Figure 6-47)
and clean it in a suitable solvent. After it is cleaned,
install the breather.
4.
Clean around the fill/check plug (Figure 6-47) and
remove the plug.
5.
Place a suitable container under the drain plug.
6.
Screw a 1 inch pipe nipple into the hole in the mounting
bracket (Figure 6-47). Using a ratchet wrench with an
extension and a 3/8” hex wrench attached, remove the
drain plug through the pipe nipple. Allow the fluid to drain
into the container. Examine the oil for signs of significant
metal particles. If any particles are found, the gearbox
may require disassembly and repair.
7.
Install the drain plug and remove the nipple.
8.
Fill the gearbox through the fill hole until the fluid is even
with the bottom of the fill hole. Fill with SAE 90 EP gear
lube.
9.
Install the fill/check plug.
Replace the Hydraulic Oil
NOTE:
ISO (International Standards Organization) #46/68
Hydraulic Oil (Mobil Fluid #424) is recommend for
year-round use in the hydraulic system.
In very cold temperatures, SAE 5W or SAE 5W-20
oils can be used if the viscosity of the oil will not be
less than 60 SUS (Saybolt Universal Seconds) at
maximum operating temperature. It may be
necessary to use a pre-heater and a longer than
normal warming period at low operating speed to
heat the oil to operating temperature.
To change the hydraulic oil:
1.
Fully retract and lower the booms.
2.
Retract all outriggers.
3.
Operate the hydraulic system until the hydraulic oil is
warm.
NOTE:
It is necessary to climb under the crane to drain the
hydraulic oil. Be sure engine is shut off, the ignition
key is removed and chock blocks are in place
before climbing under the crane.
4.
Level the crane, engage the parking brake, shut off the
engine and remove the ignition key.
5.
Place a suitable container under the hydraulic tank drain
ports (Figure 6-48).
p0412
Fill/Check Plug
Breather
Install 1” Pipe Nipple Here
Drain Plug
Plug Locations
FIGURE 6-47
p0426
Hydraulic Tank Drain Ports
FIGURE 6-48
Tank Hoses and Suction Strainer
FIGURE 6-49
p0426
Reference Only