Hydraulic Cylinder Repair - Woods BH85 Operator's Manual

operator's console (See Control Handle Operation,
page 14).
WARNING! Do not operate backhoe if functions differ
from the decal.
Pay specific attention to the float position of the boom.
WARNING! Moving the backhoe's Boom Control into
the float position relieves all pressure from the boom
hydraulic cylinder. That allows the boom to move up,
or down freely as dipper and bucket controls are
operated. However, if the backhoe bucket is not in
contact with the ground, moving to float will allow the
backhoe to drop quickly to the ground. Only use the
float position when the bucket is on the ground.
If the functions differ from the decal, check to make
sure control linkage is correctly installed and check
plumbing schematics to make sure hoses are correctly
connected.
Figure 21. Control Lever Adjustment

HYDRAULIC CYLINDER REPAIR

CAUTION
Never strike a pivot pin or punch with a nail
■
hammer because the face may chip, possibly
resulting in an eye or other serious injury. Use a
soft face hammer.
Cylinder Service
The cylinders are designed to be reliable and easy to
service. If a cylinder should malfunction during the war-
ranty period, return the complete cylinder assembly,
without disassembling, to your authorized service
department or contact your authorized service depart-
ment for instructions. Unauthorized disassembly of a
cylinder in the warranty period will VOID WARRANTY.
MAN1272 (10/22/2019)
NOTE: Repair to cylinders is limited to replacing
seals, wear rings, and O-rings. Replacing rod, bar-
rel, or pistons is not cost effective. Purchasing a
complete cylinder is more economical.
Check stamping on barrel before ordering repair parts.
See Parts page 43 and page 44 for correct numbers.
General Hydraulic Repair Information
A clean working area is essential for any hydraulic
repair.
All parts must be carefully cleaned before reassembly.
We recommend that when repairing hydraulic compo-
nents, you always replace existing seals with new
ones. Clean all components in solvent and blow dry
with low pressure air.
NOTE: Spanner wrench 1021841 is available from
Woods to help with assembly and disassembly.
Swing Cylinders (Figure 22)
Disassembly
On spanner nut style cylinders, unscrew spanner nut
(6) using a spanner wrench, or carefully use a punch
and hammer.
Tap rod guide (2) into barrel about 1/2". Remove round
retaining ring (K). Pull on rod (3) to remove parts from
barrel.
Clamp cross pin end of rod assembly in a vise with pro-
tective jaws. Remove lock nut (4) from rod assembly.
Remove piston (5) and rod guide (2) from rod.
Remove and discard all seals, wear rings and O-rings.
Clean all components in solvent and blow dry with low
pressure air.
Inspect inside diameter of barrel. Replace cylinder if
damaged.
Figure 22. Spanner Nut Cylinder Assembly
Dealer Service 27