SkyTrak 8042 Service Manual - Manual (Page 486)

8.71 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
Note: Before removing any fittings from the pump, note
their orientation to ensure correct installation.
9. Remove the four capscrews (9) and four
lockwashers (10) securing the flange halves (11) to
the check valve manifold (12). Remove the outlet
hose (13) and o-ring (14). Remove the tank hose
(15) from the check valve manifold.
10. Disconnect the case drain hose (16) from the fitting
(17).
11. Disconnect the load sense lines (18) and "T"
connection (19).
12. Remove the four capscrews (24) and four
lockwashers (25) securing the check valve manifold
(12) to the pump (5). Remove the check valve
manifold from the pump.
Note: On early production units, the check valve is a
remote mounted inline type; installed between the pump
and the main control valve. For these units, remove the
outlet hose from the pump; the check valve can remain
in place for pump removal. For these early production
units, an update kit is available to update your unit to
current production. Contact the JLG Parts Department at
717-485-6472 to order the kit.
13. Remove the four capscrews (20), four lockwashers
(21) and four plain washers (22) securing the pump
(5) to the transmission. Remove the o-ring (23)
located between the transmission and the pump.
Wipe up any hydraulic oil spillage.
b. Tools Required for Pump Repair
The following tools are used for servicing the pump:
• Ball Peen Hammer
• Plastic Tip Hammer
• Hex (Allen) Wrenches (Metric)
• Wrenches (Metric)
• Flat Tip Screwdriver
• Lock Ring Pliers
• Torque Wrench
• Copper Hammer
• Brass Punch
c. General Repair Precautions
1. To facilitate repair of the pump, and before any work
is done, read and understand all of the steps used in
the disassembly and assembly procedures.
2. Perform procedures in a clean area. It is important to
service hydraulic equipment in an environment as
clean as possible.
3. If it becomes necessary to pry sections apart, be
extremely careful to avoid damaging the machined
surfaces. Excessive force used while prying can
result in misalignment and serious damage to parts.
4. Match-mark the exterior surfaces of any housings
before separating the components. Use the marks to
return components to their original positions during
assembly.
5. To help prevent damage, DO NOT grip machined
surfaces in a vise.
Note: If parts are difficult to fit together during assembly,
tap gently with a soft hammer. NEVER use an iron or
steel hammer to tap parts.
MH3230
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