page 3–8
Jack Assembly Torque Specification
Jack Assembly with Threads Oiled
1. Jack Cap Assembly to Jack Actuator Cylinder 75 to 85 Foot Pounds
2. Jack Actuator Cylinder to Jack Base Assembly 55 to 65 Foot Pounds
Jack Base Assembly with Threads Oiled
1. Jack Pump Cylinder to Jack Base Machined 45 to 55 Foot Pounds
2. Jack Pin Housing to Jack Base Machined 35 to 45 Foot Pounds
3. Jack Base Plugs to Jack Base Machined 8 to 12 Foot Pounds
4. Jack Valve Plug to Jack Base Machined 8 to 12 Foot Pounds
5. Flow Control Valve to Jack Base Machined 16 to 20 Foot Pounds
Hydraulic Troubleshooting
Be sure the pedal linkage has been adjusted properly before beginning service on the jacks (see page 3–5).
PROBLEM/SYMPTOM SOLUTION
Jack will not raise to full height. Add hydraulic fluid (page 3–9). Check for leaks.
Jack will not hold in raised position. Close the needle valve completely. If the jack holds,
replace the release valve (page 3–12).
Jack will not pump up and the jack actuator
rod does not move.
Close the needle valve. If the jack will now pump up,
replace the release valve (page 3–12). If the jack still
will not pump up after closing the needle valve, replace
the poppet valve (page 3–12).
Jack will not pump up but the jack actuator rod
does move when the pump pedal is activated.
Replace the check valve (page 3–11).
Jack will not pump up and the jack actuator
rod may or may not move.
Remove the excess air (vacuum) in the hydraulic sys-
tem (see below).
Contact Stryker technical service at 1–800–327–0770 for further assistance.
Removing Excess Air (Vacuum) from the Hydraulic System
Procedure:
1. Verify all hydraulic linkages are secure and operating properly (see page 3–5).
2. Using pump pedal, actuate system several times. This will force the air through the system and the jack
should now pump up.
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