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The Toro / Exmark 135-7903 left hand hydro assembly is a genuine OEM hydraulic assembly for select commercial zero-turn mower applications. Listed as HYDRO-LH, this assembly is designed for compatible left-hand hydro drive systems.
OEM Toro and Exmark hydraulic drive parts are built to match factory specifications for fit, performance, and reliability. A worn or failing hydro assembly can cause weak drive power, loss of motion, uneven tracking, hydraulic noise, vibration, or poor mower control.
This 135-7903 HYDRO-LH assembly is commonly used on select Exmark Lazer Z E-Series and S-Series models, along with select Toro Z Master 3000 and 5000 Series commercial mower applications. Fitment depends on model number, serial number range, and left-hand or right-hand side, so always verify before ordering.
Toro / Exmark 135-7903 Specs
Brand: Toro / Exmark
Part Number: 135-7903
Product Type: Hydraulic Assembly / Hydro Assembly
Description: HYDRO-LH
Side: LH / Left Hand
OEM / Aftermarket: Genuine OEM
Application: Hydro drive system
Common Equipment: Exmark Lazer Z E-Series, Lazer Z S-Series, Toro Z Master 3000 Series, and Toro Z Master 5000 Series commercial mowers
Common Exmark Lazer Z Fitment
Toro / Exmark 135-7903 is commonly used on select Exmark Lazer Z models including:
LRS749AKC604A1
LRS749AKC724A1
LRS801GKA604A1
LRS801GKA604C1
LRS801GKA60RA1
LRS801GKA724A1
LRS801GKA72RA1
LZE740EKC60400
LZE742GKC604A3
LZE751CKA604A1
LZE751GKA604A1
LZE751GKA604C1
LZE751GKA724A1
LZE801CKA604A1
LZE801GKA604A1
LZE801GKA604C1
LZE801GKA724A1
LZE801GKA724C1
LZE810GBV604A3
LZS740PKC60400
LZS740PKC72400
LZS749AKC604A1
LZS749AKC72400
LZS749AKC724A1
LZS749EKC524A2
LZS801CKA60RA1
LZS801CKA72RA1
LZS801GKA604A1
LZS801GKA60RA1
LZS801GKA72RA1
LZS850EKA604W0
Common Toro Z Master Fitment
Toro / Exmark 135-7903 is commonly associated with select Toro Z Master commercial mower applications, including:
72923 - Z Master 5000 60 in. Rear Discharge
72924 - 5000 Series Rear Discharge 60 in. 26.5 hp EFI 747cc
72950 - Z Master Professional 3000 Series 60 in. TURBO FORCE Side Discharge
72953 - Z Master 5000 60 in. MyRIDE
72957 - 5000 Series MyRIDE 60 in. 26.5 hp EFI 747cc
72958 - Z Master Commercial 3000 Series 60 in. TURBO FORCE Side Discharge
72959 - Z Master Commercial 3000 Series 72 in. TURBO FORCE Side Discharge
Part Number / Search Terms
Toro / Exmark 135-7903 may also be searched as:
135-7903
1357903
Toro 135-7903
Exmark 135-7903
Toro Exmark 135-7903
HYDRO-LH
Toro HYDRO-LH
Exmark HYDRO-LH
Toro left hand hydro assembly
Exmark left hand hydro assembly
Toro hydraulic assembly
Exmark hydraulic assembly
Toro hydraulic drive assembly
Exmark hydraulic drive assembly
Lazer Z left hand hydro
Z Master left hand hydro
LH hydro assembly
Left hand hydraulic drive assembly
Important Fitment Note
Toro / Exmark 135-7903 is a left hand hydro assembly. Many Toro and Exmark commercial mowers use different hydro assemblies depending on model, serial number range, engine option, deck size, and left-hand or right-hand side.
Before ordering, confirm:
Your mower model number
Your mower serial number
Whether you need the LH / left-hand hydro assembly
Your original hydro assembly part number
Your deck size and engine configuration
Frequently Asked Questions
Is Toro / Exmark 135-7903 an OEM part?
Yes. Toro / Exmark 135-7903 is a genuine OEM left hand hydro assembly.
What does HYDRO-LH mean?
HYDRO-LH means left hand hydraulic drive assembly. This part is for compatible left-hand hydro drive systems.
What models does 135-7903 fit?
This hydro assembly is commonly used on select Exmark Lazer Z E-Series and S-Series models, plus select Toro Z Master 3000 and 5000 Series commercial mower applications.
Does 135-7903 fit the right side?
No. This listing is for the left hand hydro assembly. Right hand hydro assemblies are different and must be matched separately by model and serial number.
What is the matching right hand hydro assembly?
The matching right hand version for this fitment group is Toro / Exmark 135-7904 HYDRO-RH.
How do I confirm this is the correct hydro assembly?
Check your mower model number, serial number, side of the mower, and original hydro assembly part number before ordering.
Should I verify fitment before ordering?
Yes. Always verify your model number, serial number range, side, and original part number before ordering.
P&P Small Engines stocks genuine Toro and Exmark hydraulic assemblies and commercial mower parts to help keep Lazer Z and Z Master equipment running properly.
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