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Hydrostatic Transmission Flushing Circuit
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Model

YRGULANAL

   
   
Control
  • Standard Options
  • C
    Tamper Resistant - Factory Set
  • K
    Handknob
  • L
    Standard Screw Adjustment
  • W
    Hex Wrench Adjustment
  • Y
    Tri-Grip Handknob
  • Additional Options
  • F
    Hex Head Screw with Locknut
  • J
    Capped Screw Adjustment
  • M
    Capped Screw Adjustment with Lockwire Holes
  • Q
    Capped and Lockwired
  • R
    Capped Screw Adjustment
Adjustment Range
  • Standard Options
  • A
    500 - 3000 psi (35 - 210 bar), 1000 psi (70 bar) Standard Setting
  • C
    1000 - 6000 psi (70 - 420 bar), 1000 psi (70 bar) Standard Setting
  • D
    200 - 800 psi (14 - 55 bar), 400 psi (28 bar) Standard Setting
  • E
    100 - 400 psi (7 - 28 bar), 200 psi (14 bar) Standard Setting
  • S
    50 - 200 psi (3,5 - 14 bar), 100 psi (7 bar) Standard Setting
  • W
    800 - 4500 psi (55 - 315 bar), 1000 psi (70 bar) Standard Setting
  • Additional Options
  • B
    300 - 1500 psi (20 - 105 bar), 1000 psi (70 bar) Standard Setting
Seal Material
  • Standard Options
  • N
    Buna-N
  • V
    Viton
Primary Cartridge
  • Standard Options
  • A
    A (with RDDA primary cartridge, Direct-acting relief valve)
  • A
    A (with RDDA3 primary cartridge, Non-adjustable direct-acting relief valve)
Port and Material Designation
  • Standard Options
  • C
    Ports 1 & 2 — 1/2" NPTF; Port T — 3/8" NPTF; Aluminum
  • C/S
    Ports 1 & 2 — 1/2" NPTF; Port T — 3/8" NPTF; Iron
  • D
    Ports 1 & 2 — 3/4" NPTF; Port T — 3/8" NPTF; Aluminum
  • D/S
    Ports 1 & 2 — 3/4" NPTF; Port T — 3/8" NPTF; Iron
  • K
    Ports 1 & 2 — SAE 10; Port T — SAE 8; Aluminum
  • K/S
    Ports 1 & 2 — SAE 10; Port T — SAE 8; Iron
  • L
    Ports 1 & 2 — SAE 12; Port T — SAE 8; Aluminum
  • L/S
    Ports 1 & 2 — SAE 12; Port T — SAE 8; Iron
  • V
    Ports 1 & 2 — 1/2" BSPP; Port T — 3/8" BSPP; Aluminum
  • V/S
    Ports 1 & 2 — 1/2" BSPP; Port T — 3/8" BSPP; Iron
  • W
    Ports 1 & 2 — 3/4" BSPP; Port T — 3/8" BSPP; Aluminum
  • W/S
    Ports 1 & 2 — 3/4" BSPP; Port T — 3/8" BSPP; Iron
Model: YRGU

Hydrostatic transmission assembly, with cross-port relief

Capacity:

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Model

YRGULANAL

   
   
Control
  • Standard Options
  • C
    Tamper Resistant - Factory Set
  • K
    Handknob
  • L
    Standard Screw Adjustment
  • W
    Hex Wrench Adjustment
  • Y
    Tri-Grip Handknob
  • Additional Options
  • F
    Hex Head Screw with Locknut
  • J
    Capped Screw Adjustment
  • M
    Capped Screw Adjustment with Lockwire Holes
  • Q
    Capped and Lockwired
  • R
    Capped Screw Adjustment
Adjustment Range
  • Standard Options
  • A
    500 - 3000 psi (35 - 210 bar), 1000 psi (70 bar) Standard Setting
  • C
    1000 - 6000 psi (70 - 420 bar), 1000 psi (70 bar) Standard Setting
  • D
    200 - 800 psi (14 - 55 bar), 400 psi (28 bar) Standard Setting
  • E
    100 - 400 psi (7 - 28 bar), 200 psi (14 bar) Standard Setting
  • S
    50 - 200 psi (3,5 - 14 bar), 100 psi (7 bar) Standard Setting
  • W
    800 - 4500 psi (55 - 315 bar), 1000 psi (70 bar) Standard Setting
  • Additional Options
  • B
    300 - 1500 psi (20 - 105 bar), 1000 psi (70 bar) Standard Setting
Seal Material
  • Standard Options
  • N
    Buna-N
  • V
    Viton
Primary Cartridge
  • Standard Options
  • A
    A (with RDDA primary cartridge, Direct-acting relief valve)
  • A
    A (with RDDA3 primary cartridge, Non-adjustable direct-acting relief valve)
Port and Material Designation
  • Standard Options
  • C
    Ports 1 & 2 — 1/2" NPTF; Port T — 3/8" NPTF; Aluminum
  • C/S
    Ports 1 & 2 — 1/2" NPTF; Port T — 3/8" NPTF; Iron
  • D
    Ports 1 & 2 — 3/4" NPTF; Port T — 3/8" NPTF; Aluminum
  • D/S
    Ports 1 & 2 — 3/4" NPTF; Port T — 3/8" NPTF; Iron
  • K
    Ports 1 & 2 — SAE 10; Port T — SAE 8; Aluminum
  • K/S
    Ports 1 & 2 — SAE 10; Port T — SAE 8; Iron
  • L
    Ports 1 & 2 — SAE 12; Port T — SAE 8; Aluminum
  • L/S
    Ports 1 & 2 — SAE 12; Port T — SAE 8; Iron
  • V
    Ports 1 & 2 — 1/2" BSPP; Port T — 3/8" BSPP; Aluminum
  • V/S
    Ports 1 & 2 — 1/2" BSPP; Port T — 3/8" BSPP; Iron
  • W
    Ports 1 & 2 — 3/4" BSPP; Port T — 3/8" BSPP; Aluminum
  • W/S
    Ports 1 & 2 — 3/4" BSPP; Port T — 3/8" BSPP; Iron
Function
Function image

Technical specifications

  • Modifiers
    Ports
    • C, C/S
      Ports 1 & 2: 1/2" NPTF; Port T: 3/8" NPTF;
    • D, D/S
      Ports 1 & 2: 3/4" NPTF; Port T: 3/8" NPTF;
    • K, K/S
      Ports 1 & 2: SAE 10; Port T: SAE 8;
    • L, L/S
      Ports 1 & 2: SAE 12; Port T: SAE 8;
    • V, V/S
      Ports 1 & 2: 1/2" BSPP; Port T: 3/8" BSPP;
    • W, W/S
      Ports 1 & 2: 3/4" BSPP; Port T: 3/8" BSPP;
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    This valve assembly provides high pressure cross-port relief protection and a flushing circuit for hydrostatic transmissions. The hot oil flushing circuit allows a discharge of oil from the low pressure side of the loop. The charge pump replaces the hot, dirty oil with cool, filtered oil. The hot oil discharge is often passed through the cases of the pump and the motor, flushing hot, dirty oil from them as well.

    • A unique feature of the hot oil shuttle is that the setting of the hot oil relief can be confirmed or adjusted when the transmission is in neutral.
    • When the transmission is in neutral the charge pressure is controlled by the charge pump relief. When the hot oil shuttle opens, some or all of the charge pump flow is redirected to the hot oil relief. The charge pump relief must be set higher than the hot oil relief to produce hot oil flow. The higher the differential pressure between the 2 reliefs, the higher the hot oil flow. The amount of hot oil flow is determined by the pressure vrs flow curves of the 2 reliefs and is difficult to quantify.
    • The standard setting of the hot oil relief is 200 psi (14 bar) at a flow of 4 gpm (16 L/min).
    • Hydraulic motors leak. Therefore a mechanical brake is recommended to positively lock any stopped live load.
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    • Body Type
      Motor mount
    • Interface
      Eaton/Char-Lynn 2000
    • Capacity
      10 gpm
    • Why doesn't Sun anodize their aluminum bodies?
    • How big is a drop of hydraulic oil?  
    • Direct acting or pilot operated - what do I use?
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    • Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port type/size specified.
    • For detailed information regarding the cartridges contained in this assembly, click on the models codes shown in the Included Components tab.
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