Dealer Service - Woods BH90-X Operator's Manual

The information in this section is written for dealer ser-
vice personnel. The repair described here requires
special skills and tools. If your shop is not properly
equipped or your mechanics are not properly trained in
this type of repair, it may be more time and cost effec-
tive to replace complete assemblies.
 Keep hands and body away from pressurized
lines. Use paper or cardboard, not hands or other
body parts to check for leaks. Wear safety goggles.
Hydraulic fluid under pressure can easily penetrate
skin and will cause serious injury or death.
 Make sure that all operating and service person-
nel know that if hydraulic fluid penetrates skin, it
must be surgically removed as soon as possible by
a doctor familiar with this form of injury or gan-
grene, serious injury, or death will result.
CONTACT A PHYSICIAN IMMEDIATELY IF FLUID
ENTERS SKIN OR EYES. DO NOT DELAY.
 Before working on backhoe, extend boom and
dipperstick and place bucket on ground. Make sure
that all system pressure has been relieved by oper-
ating controls before maintenance, service, or dis-
connecting any hydraulic lines.
HYDRAULIC CYLINDER REPAIR
Check stamping on barrel before ordering repair parts.
See Parts page 44 and page 45 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.
Bucket, Swing & Stabilizer Cylinders
Refer to Figure 15 and Figure 16.
Disassembly
On spanner nut style cylinders, unscrew spanner nut
(4) using a spanner wrench, or carefully use a punch
and hammer.

22 Dealer Service

DEALER SERVICE
ARNING
Tap rod guide (5) into barrel (8) about 1/2". Remove
round retaining ring (3B). Pull on rod (1) to remove
parts from barrel.
Clamp cross pin end of rod assembly (1) in a vise with
protective jaws. Remove lock nut (7) from rod assem-
bly. Remove piston (6) and rod guide (5) 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 (8). Replace cylinder if
damaged.
Figure 15. Spanner Nut Cylinder Assembly
Assembly
Lubricate O-rings and seals with clean hydraulic fluid.
Install back-up washer (3E) on rod guide (5), then
install O-ring (3F) in exterior O-ring groove of rod
guide. Install rod seal (3D) into inner groove of rod
guide with open portion of V-groove toward piston.
Place rod wiper (3C) in outer rod guide groove. Slide
rod guide assembly (5) onto rod (1). Place wear ring
(3H) in narrow groove of piston (except on swing cylin-
der). Place piston seal (3G) in wide piston groove.
Place piston ring (3J) in narrow grove on piston (on
swing cylinder only).
Lightly coat rod threads with hydraulic oil and slide O-
ring (3A) over threads and into groove. Install piston (6)
onto rod (1) with wear ring on side away from rod
guide. Install lock nut (7) and torque to 175 lbs-ft for
swing cylinder. For bucket and stabilizer cylinders,
torque to 275 lbs-ft.
Compress wear ring and piston seal and carefully
insert piston and rod assembly into barrel. Use care to
prevent damage while installing.
(Rev. 10/17/2008)
MAN0451 (6/2/2006)