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A gearbox for an irrigation system can comprise a housing, a worm gear within the housing and a bull gear within the housing and configured to engage the worm gear. The housing can be configured to receive a removable cartridge. The cartridge can include a diaphragm and a vent. The diaphragm can def

A gearbox for an irrigation system can comprise a housing, a worm gear within the housing and a bull gear within the housing and configured to engage the worm gear. The housing can be configured to receive a removable cartridge. The cartridge can include a diaphragm and a vent. The diaphragm can define a chamber configured for expansion and contraction and configured to be positioned inside the housing to relieve pressure build-up within the housing. The vent can be configured to allow air to flow between the atmosphere and the chamber.

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1. A gearbox for an irrigation system comprising: a housing;a worm gear within the housing;a bull gear within the housing and configured to be engaged with the worm gear; anda removable cartridge configured to couple to the housing, the cartridge comprising: a diaphragm defining a chamber configured

1. A gearbox for an irrigation system comprising: a housing;a worm gear within the housing;a bull gear within the housing and configured to be engaged with the worm gear; anda removable cartridge configured to couple to the housing, the cartridge comprising: a diaphragm defining a chamber configured for expansion and contraction and configured to be positioned inside the housing to relieve pressure build-up within the housing; anda vent configured to allow air to flow between the atmosphere and the chamberwherein the cartridge is configured to be adjacent the worm gear with the diaphragm on a back side of the cartridge facing away from the worm gear. 2. The gearbox of claim 1, wherein the cartridge further comprises at least one sensor port. 3. The gearbox of claim 2, further comprising at least one of a temperature sensor, an oil level sensor, a pressure sensor, and a moisture sensor. 4. The gearbox of claim 2, wherein the at least one sensor port is configured to allow an attached sensor to extend vertically uninterrupted to a bottom of the housing. 5. The gearbox of claim 2, wherein the at least one sensor port is configured to position a sensor inside the gearbox between a front side of the cartridge and the worm gear. 6. The gearbox of claim 2, wherein the at least one sensor port is configured to position a sensor inside the gearbox between a front side of the cartridge, a bearing, a shaft and the worm gear. 7. A gearbox for an irrigation system comprising: a housing;a worm gear within the housing; anda bull gear within the housing and configured to engage the worm gear;wherein the housing comprises a cartridge opening at a top of the housing configured to receive an expansion cartridge, the opening having a main section and at least one lobe extending from the main section and configured to allow a sensor connected to the cartridge to enter the housing, the lobe positioned to allow the sensor to extend vertically downward from the lobe towards a bottom of the housing. 8. The gearbox of claim 7, further comprising a second lobe, wherein each lobe is on opposite ends of the opening. 9. The gearbox of claim 8, wherein each lobe extends away from the main section in the same direction. 10. The gearbox of claim 7, further comprising a diaphragm configured to connect to a top of the housing and to cover the opening. 11. The gearbox of claim 7, further comprising the expansion cartridge to be received into the opening. 12. The gearbox of claim 11, wherein the expansion cartridge comprising a diaphragm configured to be within the housing and at least one sensor port. 13. The gearbox of claim 12, further comprising at least one of a temperature sensor, an oil level sensor, a pressure sensor, and a moisture sensor.