Manitowoc Grove GRT8100 Service Manual

2-69
GROVE
GRT8100 SERVICE MANUAL HYDRAULIC SYSTEM
2
Published 3/26/2018, Control # 596-05
CYLINDERS
Cylinder Rod Surface Protection
Steel cylinder rods include a thin layer of chrome plating on
their surfaces to protect them from corroding. However,
chrome plating inherently has cracks in its structure which
can allow moisture to corrode the underlying steel. At typical
ambient temperatures, hydraulic oil is too thick to penetrate
these cracks. Normal hydraulic operating temperatures will
allow hydraulic oil to warm sufficiently to penetrate these
cracks and if machines are operated daily, protect the rods.
Machines that are stored, transported, or used in a corrosive
environment (high moisture, rain, snow, or coastline
conditions) need to have the exposed rods protected more
frequently by applying a protectant. Unless the machine is
operated daily, exposed rod surfaces will corrode. Some
cylinders will have rods exposed even when completely
retracted. Assume all cylinders have exposed rods, as
corrosion on the end of the rod can ruin the cylinder.
It is recommended that all exposed cylinder rods be
protected using Boeshield® T-9 Premium Metal Protectant.
Manitowoc Crane Care has Boeshield® T-9 Premium Metal
Protectant available in 12 oz. aerosol cans by ordering part
number 9999101803.
Leak Check
A hydraulic cylinder should not be disassembled unless it is
essential. The following checks will provide a means of
determining if a cylinder has a faulty or leaking piston seal.
1. Extend rod to its maximum stroke. Remove retract hose
from cylinder. Cap retract hose.
2. Apply hydraulic pressure to piston side of cylinder and
observe open cylinder port for leaks. If leaks are
observed, cylinder seals must be replaced.
3. Fully retract cylinder rod (except telescope cylinder).
Remove extend hose from cylinder. Cap extend hose.
4. Apply hydraulic pressure to retract (rod) side of cylinder
and observe open cylinder port for leaks.
If leaks are observed, cylinder seals must be replaced.
5. Reconnect all cylinder ports.
CAUTION
Cylinder operation and inclement weather will remove the
Boeshield® protectant; therefore, inspect machines once
a week and reapply Boeshield® to unprotected rods.
DANGER
Ensure pressure is applied to piston side of cylinder only
and retract hose is capped.
DANGER
Ensure pressure is only applied to retract (rod) side of
cylinder and extend hose is capped.

Manitowoc Grove GRT8100 Specifications

General

Brand	Manitowoc
Model	Grove GRT8100
Category	Construction Equipment
Language	English