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Model 6210 Maintenance Manual
Section 7.Component Procedures
Hydraulic Components Hydraulic System
Lower
When lowering, the load-hold valve (SOL1) and proportional lowering valve (SOL2) open to allow the oil in the pressure lines to return to the oil tank. The lowering speed is regulated by the proportional lowering valve.
Operating Pressure
The operating pressure at rated load is 2400 PSI (165 bar).
Relief Valve
The relief valve opens at 3100 PSI (214 bar).
General Guidelines
To prolong the life of your Raymond pallet truck, follow these guidelines:
•Keep all fittings and connections tight to prevent leaks. Use care when tightening fittings. Over-tightening can cause damage or distortion.
•Before you remove any component from the hydraulic system, wash the component and surrounding area with cleaning solvent to prevent foreign matter from entering the system. Cap and plug all openings immediately.
•Whenever you remove a fitting with a pipe thread, use a sealing compound on the outside of the threads before you reinstall the fitting. (Do not use Teflon ® tape.) Make sure all parts are clean.
•When you install a hose assembly, make sure it is not twisted when the fittings are tightened. Always use two wrenches on a swivel-type fitting—one to hold the fitting and the other to tighten the hose.
•Keep the hose clamps tight to prevent the hoses from chafing and to avoid leaks.
•Route hoses so they do not rub on sharp edges.
•Thoroughly clean up any spilled hydraulic fluid.
•Store and handle hydraulic fluid with care to prevent moisture and foreign matter from entering the hydraulic system.
•Contaminated hydraulic fluid is a major cause of hydraulic system failures. Keep any service equipment, such as containers, funnels, and hand pumps, clean at all times. Cover them when not in use.
•Dispose of waste fluid correctly.
•Do not overtighten cable ties used to secure hoses. Hoses expand when in use.
Hydraulic Unit Torque Specifications
The following table provides torque specifications for the hydraulic unit components.
Component Torque in. lb. (Nm)
Check Valve216 to 240 in. lb. (24 to 27 Nm)
Load Holding Valve216 to 240 in. lb. (24 to 27 Nm)
Pressure Compensated Flow Control Valve 216 to 240 in. lb. (24 to 27 Nm)
Low Profile Relief Valve155 to 175 in. lb. (17.5 to 19.8 Nm)
Coil Retaining Nut48 to 60 in. lb. (5.4 to 6.8 Nm)
Outlet/Return Port216 to 240 in. lb. (24 to 27 Nm)
Breather Vent PlugFinger tight plus 2 to 3 turns with a wrench
Motor to Pump Mounting Bolts 96 to 120 in. lb. (10.8 to 13.5 Nm)
Pump to Reservoir
Mounting Clamp Screw 45 to 55 in. lb. (5.1 to 6.2 Nm)
Publication: 1146947, Revised: 12 Jan 2017 7-71
