IV-53
HYDRAULIC UNITS
CONTROL VALVE
Adjusting the Main Relief Valve Pressure
1. Install a pressure gauge in the following pres-
sure sensor port.
• Control valve pressure sensor port.
“II. Specifications, Standards for Judg-
ing Performance”
2. Run the pump at the rated speed.
3. Operate the control valve
·
s cylinder spool over
its full stroke and read the value indicated by the
pressure gauge.
4. Turn the set screw (1) while watching the pres-
sure gauge to adjust.
Turning it to the right increases the set pres-
sure.
Turning it to the left decreases the set pressure.
5. After completing the pressure adjustment, tight-
en the lock nut (2) while holding the set screw
(1) so it won
·
t turn.
Operate the relief valve again and check if the
pressure is stabilized.
INSPECTION AND ADJUSTMENT
Checking the Parts
Parts
Judgment Criteria
Treatment
Housing,
Section Body
• Scratches, rust, corrosion of the portion which slides
against the spool.
• Scratches, rust, corrosion of the seal pocket portion of
the part that enters the spool.
• Scratches, rust, corrosion of the port seal portion which
is in contact with the O-ring.
• Scratches, rust, corrosion of the seal portion of the relief
valve, etc.
• Other damage which could be a hindrance to correct
function.
• Replace
• Replace
• Replace
• Replace
• Replace
Spool
• Scratch marks like being clawed around the outer cir-
cumference sliding portion.
• Scratches on the portion that slides against the seals on
both ends.
• Spool not operating smoothly.
• Replace
• Replace
• Repair or replace.
Load Check Valve
• Imperfect sealing due to damage to the valve or spring.
• Does not catch, but operates lightly when inserted in the
section body and operated.
• Repair or replace.
• Normal
Around Springs
• Rust, corrosion, deformation, breakage or other marked
damage to the spring, holder or cover.
• Replace
Around Spool Seal
• Oil leaking to the outside.
• Rust, corrosion or deformation of the seal holder.
• Repair or replace.
• Repair or replace.
Main Relief Valve,
Port Relief Valve,
Anti-Cavitation Valve
• External rust, damage.
• Damage to valve seat contact surface.
• Damage to poppet contact surface.
• Abnormality in the spring.
• O-rings, backup rings, seals
• Replace
• Replace
• Replace
• Replace
• As a rule, all these
should be replaced.
Summary of Contents for TL150
Page 1: ...TL150 Track Loader BOOK No CT7E901 WORKSHOP MANUAL Serial No 21500004...
Page 4: ...0 4...
Page 5: ...I 1 I GENERAL...
Page 18: ...I 14 GENERAL...
Page 19: ...II 1 II SPECIFICATIONS...
Page 44: ...III 1 III MACHINE CONFIGURATION...
Page 94: ...III 51 MACHINE CONFIGURATION ELECTRICAL SYSTEM ELECTRICAL SYSTEM ELECTRICAL WIRING DIAGRAM...
Page 122: ...III 79...
Page 146: ...MACHINE CONFIGURATION III 103...
Page 147: ...IV 1 IV HYDRAULIC UNITS...
Page 152: ...IV 6 HYDRAULIC UNITS HST PUMP 1 Plug 2 Plug 3 Plug 4 Screw 5 Seal Nut 6 Plug Pump Assembly 4 4...
Page 189: ...IV 43 HYDRAULIC UNITS GEAR PUMP INSPECTION AND ADJUSTMENT IV 36 38 TROUBLESHOOTING IV 39...
Page 230: ...IV 84 HYDRAULIC UNITS PILOT VALVE INSPECTION AND ADJUSTMENT IV 79 TROUBLESHOOTING IV 80...
Page 261: ...IV 115 HYDRAULIC UNITS TRAVEL MOTOR DISASSEMBLY AND ASSEMBLY Special tools...
Page 263: ...IV 117 HYDRAULIC UNITS TRAVEL MOTOR...
Page 282: ...IV 136 HYDRAULIC UNITS TRAVEL MOTOR...
Page 283: ...V 1 V TROUBLESHOOTING...