Hyster A238 Manual Download Page 20

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1. VALVE HOUSING

2. INLET MODULE

3. RELIEF VALVE

4. PILOT PRESSURE SUPPLY VALVE

5. SOLENOID

6. CYLINDER

Figure 17. Directional Control Valve – Schematic (SS Carriage with FP shown)

Description And Operation

4000 SRM 1664

Summary of Contents for A238

Page 1: ...MAST H16XM9 12 H18XM 7 5 9 H360 36HD H360 48HD A238 B238 PART NO 4097319 4000 SRM 1664...

Page 2: ...dic Maintenance section Keep the unit clean and the working area clean and orderly Use the correct tools for the job Keep the tools clean and in good condition Always use HYSTER APPROVED parts when ma...

Page 3: ...rd Carriage with Manual Fork Positioning 10 Standard Carriage with Hydraulic Fork Positioning 10 Integral Side Shift ISS Carriage with Pin Type Forks 11 Dual Function Side Shift and Fork Positioning C...

Page 4: ...Positioner Cylinder for DFSSFP Carriage 32 Clean and Inspect 32 Assemble Fork Positioner Cylinder for DFSSFP Carriage 33 Install 34 Side Shift Cylinder 34 Remove 34 Disassemble 34 Clean and Inspect 35...

Page 5: ...ion Check 59 Mast Operation Check 60 Fork Inspection 60 Lift Chains 61 Lift Chains Cleaning 61 Lift Chain Inspection 61 Lift Chain Lubricant Requirements 62 Lift Chain Lubrication Procedure 62 Leak Ch...

Page 6: ...ar shaking Movement or Slight Carriage Movement When Starting Engine 73 Unequal Movement of Left And Right Tilt Cylinder 73 Insufficient Lifting Speed 73 Insufficient Lifting Capacity 73 Incorrect Low...

Page 7: ...ast are provided by the tilt cylinders Different carriage options exist for side shifting fork positioning or for attachments The masts for H16XM 9 H18XM 7 5 H360 36HD and H16XM 12 H18XM 9 H360 48HD t...

Page 8: ...ston side is limited by the 19 MPa 2756 psi relief valve at port A Extruded oil from the rod side has to pass the pilot operated check valve that opens if oil pressure at the piston side is at least 2...

Page 9: ...e primary function of the lowering control valve is to limit the lowering speed in case of a malfunction of the supply return connection The different lift height capacities are determined by the dime...

Page 10: ...The area between shell and rod is closed off by a 1 MPa 145 psi check valve which is located at the lower cross member of the outer mast The function of the 1 MPa 145 psi check valve is to retain air...

Page 11: ...ce Operation The emergency lowering valve is located at the left hand side of the main control valve and can be accessed after removal of the cover above it See Figure 6 Initial turning of the hand wh...

Page 12: ...damaged The link pins are riveted into the outer plates The press fit of the link pins in the outer plates is essential for the integrity of the chain The inner plates have a tight sliding fit for an...

Page 13: ...and plates is pushed away under load conditions and must be allowed to restore daily by removing the load and allowing oil to penetrate again Restoring the oil film is effected by the capillary action...

Page 14: ...ents for Chain Lubricant The chain lubricant must be a mineral or synthetic engine oil Oil viscosity must match the ambient temperature so that the oil remains viscous and can penetrate to the contact...

Page 15: ...handling On the carriage the bearing blocks are located just above the load rollers On the mast the lower bearing blocks are above the lower rollers on the inner mast The upper bearing blocks are at t...

Page 16: ...k Positioning The pin type forks are positioned by fork guides that are attached to the fork positioning cylinders By activating the directional control valve the cylinders move the guides and forks i...

Page 17: ...he cab the forks can be side shifted positioned individually or positioned simultaneously The forks are either quick disconnect hook type forks or they have a design which integrates the function of t...

Page 18: ...rol valve port T Aux Alternating Pressure and Tank P T Alternating P T is applied when a limited number of functions allow the control valve on the truck to determine the direction of the oil flow Exa...

Page 19: ...f the directional control valve Harness connectors for unused functions are folded back and taped in An additional splitter harness is installed for DFSSFP carriages with simultaneous fork positioning...

Page 20: ...E HOUSING 2 INLET MODULE 3 RELIEF VALVE 4 PILOT PRESSURE SUPPLY VALVE 5 SOLENOID 6 CYLINDER Figure 17 Directional Control Valve Schematic SS Carriage with FP shown Description And Operation 4000 SRM 1...

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